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U. S. D E P A R T M E N T O F L A B O R

BUREAU OF LABOR STATISTICS
ROYAL MEEKER, Commissioner

BULLETIN OF THE UNITED STATES )
BUREAU OF LABOR ST A T ISTIC S)
IN D U S T R IA L

A C C ID E N T S

AND

(WHOLE 1 A 1
' * * (NUM BER lTL 1

H Y G IE N E

S E R IE S :

LEAD POISONING IN THE
SMELTING AND REFINING




OF LEAD

f

FEBRUARY 17, 1914

W ASHINGTON
GOVERNMENT PRINTING OFFICE
1914

No.

4




CONTENTS.

Lead poisoning in the smelting and refining of lead:

Page.

Introduction............................................................................................................... 5-17
Dangerous processes in the smelting and refining of lead....... ...............
6-8
Dust and fumes.................................................................................................. 9-11
Sanitary equipment..........................................................................................
11
Medical care.......................................................................................................
11
Disadvantages of a shifting force................................................................. 11,12
Prevalence of lead poisoning in the industry............................................. 12-14
Prevention of lead poisoning in the smelting industry............................ 14-17
Construction...............................................................................................
15
Sanitary equipment..................................................................................
15
Dust prevention.........................................................................................
16
Prevention of fumes..................................................................................
16
Control of the workmen.......................................................................
16
Medical supervision.................................................................................. 16,17
Processes used in lead smelting and refining in the United States.. . ........ 17-49
Handling the ore.............................................. ................................................ 17,18
Crushing and sampling mills.......................................................................... 19, 20
Transporting ground ore.................................................................................. 20, 21
Smelting.............................................................................................................. 21, 22
Furnaces used in lead smelting and refining in the United States___ 22-46
Ore hearths................................................................................................. 23-27
Smelting in reverberatory furnaces.......................................................
27
Reverberatory furnaces for roasting................... ................................... 27, 28
Mechanical preroasters...... ................................................................... 28, 29
Huntington-Heberlein pots..................................................................... 29-31
Continuous sintering machines....... ..................................................... 31-33
Blast furnaces............................................................................................. 33-37
Tapping floors........................................................................................... 37-39
Prevalence of lead fumes and dust on charge and tapping floors.. 39-41
Settling furnaces........................................................................................
41
Softening and refining furnaces.............................................................. 41-43
Drossing, remelting, and desilverizing kettles....................................
43
By-product or residue furnaces................... .......................................... 43,44
Retorting and cupelling furnaces.......................................................... 44-46
Liquating furnaces....................................................................................
46
Flue-dust system............................................................................................... 46-49
Heat and exertion........................ ............................................................................. 49, 50
Relative dangers of breathing lead dust and of getting lead on food.............. 50-53
Analysis of dust -and fumes............................................................................. 52, 53
Poisons other than lead encountered in lead smelting..................................... 53, 54
Lead poisoning in the smelting industry in Great Britain, Germany, and
Austria..................................................................................................................... 54-57




3

4

CONTENTS.

Lead poisoning in the smelting and refining of lead—Concluded.
rage.
Lead poisoning in the smelting industry in the United States...................... 58-81
Historical.......................... . ............................................................................... 58-61
Number and kind oi cases iVund................................................. _............. .. 01-64
Period of exposure and attack rate............................................................... 04-66
Relative danger of different kinds nf work........................ ........................ 06, 67
Influence of the seasons........................ ............................- ...........................
68
Method of collecting cases............ ............................................................. ... 08-71
Medical supervision.................................................................................... .
71—73
Sickness and accident insurance............................................................... ... 73, 74
Oharactei of employees................................................................ . ............. .. 75-78
Housing......... ............................ .....................................................................
78,79
Compulsory registration of occupational plumbism................................... 79-81
A ppen d ix
I. — The solubility of lead sulphide ores and of lead sulphide in
human gastric juice........................................................................ 82-84
A p p e n d i x II.— Regulations for the lead and copper industries, drafted by Lil­
lian Erskine, special investigator for the New Jersey Depart­
ment of Labor, approved by Ernst F. Eurich, consulting
metallurgical expert for the State, and issued in the form of a
circular letter to these trades by Lewis T. Bryant, commis­
sioner of labor.................................................................................. .85-87
A p p e n d i x III.— German regulations for lead-smelting works (June 16, 1905).. 88-90
A p p e n d i x IV.— French regulations relating to precautions against industrial
lead poisoning...................................................................................91-94
A p p e n d ix
V.— Provisions for medical inspection and care in English, German,
and French smelters.................................................................... 95-97
LIST OF PHOTOGRAPHS.
Facing pa^c—

P late
P late
P late
P late
P late
P late
P late
P late
P

late

P

late

P late
P

late

P late
P

late

P late

Sampling mill................................................................................................................
2.— Ore hearth or Scotch hearth............................................................... .
3.— Ore hearth building in partial operation..............................................
4.— Huntington-Heberlein pot................................................................ .......
5.— Belt of empty grates of a Dwight-Lloyd machine................................
6.— Feed floor......................................................................................................
7.— Blast furnace during slag tapping...........................................................
8.— Tapping floor of a blast furnace in the American Smelting Refin­
ing Co.’s plant at Murray, Utah........................................... *___ _
9.— Matte tapping in the American Smelting & Refining Co.’s plant
at Murray, U tah............................................ .........................................
10.— Tapping antimonial slag from a furnace................................................
1 1 .— Softening furnace in a refinery, with mechanical charging..............
12.— Residue furnace or copper matting furnace.................................. ........
13.— Fabre du Faur zinc distillation furnace................................................
14.— Pouring the rich lead from a retort into a cupelling furnace............
15.— Flue and bag house system.....................................................................
1 .—




19
23
24
29
82
34
37
38
38
38
42
44
44

45
46

BULLETIN OF THE

U.S. BUREAU OF LABOR STATISTICS.
w h o le

WASHINGTON.

n o . i4i.

F eb ru a ry

17, 1914

LEAD POISONINQ IN THE SMELTING AND REFINING OF
LEAD.
B Y ALICE

H A M IL T O N , M . A ., M . D .

INTRODUCTION.

The last 15 or 20 years have seen great changes in the lead smelt­
ing industry of the United States. As transportation has improved,
small and poorly equipped smelters 1 which had been built near the
deposits of ore have been abandoned and the tendency has been to
concentrate the work of smelting and refining in a few large plants,
for it has proved cheaper to ship the ore to large centers where labor
is abundant, than to do the smelting in the mining districts.
This change has resulted in a twofold advantage to the worker.
In the first place, as these large plants are usually equipped with the
latest and best machinery, the amount of handwork required has
been materially diminished. In the second place, the conditions
under which the employees work have been improved, for large,
well-built factories are usually freer from dust and fumes than are
those of the old type, and newer methods of manufacture involve
economies, such as the saving of poisonous volatile products which
used to be allowed to escape into the air. Along with the improve­
ment in equipment, there has been in recent years evidence of a greater
interest on the part of the managers in the health and safety of their
workmen, and there is probably now no plant in the United States
in which some effort is not made to lessen the dangers of lead poison­
ing as well as to prevent accidents. As a result of these changes
in most places where lead smelting is an old industry, as in south­
eastern Missouri, Pueblo, Denver, Leadville, East Helena, Omaha,
and South Chicago, the opinion is general among physicians and
townspeople, as well as among the men in the industry, that lead
poisoning is far less frequent and less severe than it used to be. As
will be seen later, it is not possible to find much documentary evi1 There is much confusion in nomenclature in the literature of lead smelting. In this report the Century
Dictionary has been followed, which permits the designation “ smelter” for the place in which the work
of smelting is done. Ttie term smelter is b y m any people used for the man who does the actual work
and b y others for the man who is engaged in the business of smelting lead.




5

6

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

dence of this improvement, yet the general impression is probably
founded on fact.
The following is a list of the smelters and refineries that form the
subject of this study:
American Smelting & Refining Co.:
Refinery, Perch Amboy, N. J.
Refinery, South Chicago, 111.
Smelting and refining, Federal, 141.
Refinery, Omaha, Nebr.
Smelter, Pueblo, Colo.
Smelter, Leadville, Colo.
Smelter, Denver, Colo.
Smelter, Murray, LTtah.
Smelter, East Helena, Mont.
International Refining Co.:
Refinery, East Chicago, Ind.
Smelter, Tooele, Utah.
United States Refining Co.:
Refinery, Graselli, Ind.
Smelter, Midvale, Utah.
American Metals Co.: Smelter, Salida, Colo.
St. Joseph Lead Co.: Smelter and refinery, Herculaneum, Mo.
Picher Lead Co.: Smelting, roasting oxides, subliming white lead, Joplin, Mo.
National Lead Co.: Smelting, subliming white lead, Collinsville, 111.
Hoyt Metal Co.: Smelting and refining scrap lead, Granite City, III.
Balbach Co.: Smelting and refining scrap lead, Newark, N. J.
Goldsmith Bros.: Smelting and refining scrap lead, Chicago, 111.

These 20 plants have an average daily pay roll of 7,500 men. The
methods they employ vary quite a little according to the character
of ore handled, and the difference in hygienic conditions seems to
depend more upon the different methods used than upon different
standards in the management. Only two plants were found in which
neglect and indifference were conspicuous, but no plant was found
in which every obvious precaution had been used. There is a general
average of fairly good conditions and fairly active interest in the
safety of the men, without any strikingly good instance and with
few shockingly bad ones. As far as could be determined in this
investigation the smelting and refining plants which have the greatest
incidence of lead poisoning are those in which unusually dangerous
processes are used. Two exceptions, however, were found to this
rule, one a smelting plant and the other a refinery, which, without
using processes any more dangerous than the others, have je t a
much higher proportion of lead poisoning because of carelessness
in management.
DANGEROUS PROCESSES IN THE SMELTING AND REFINING OF LEAD.

It may be well to give at the outstart a very brief outline of those
processes in lead smelting and refining which are attended with more
or less risk to the health of the men engaged in the industry. Roughly,



LEAD POISONING IN SMELTING AND REFINING LEAD.

7

there are three processes or groups of processes in which dangerous
conditions may be found: (1) The preparatory processes, such as
crushing and screening the ores; (2) roasting and smelting processes;
and (3) refining the metals secured by smelting. The kind, degree,
and sources of danger differ in these different processes.
As a preliminary to all these processes the ore must be received and
unloaded, an operation which may be very harmful, reasonably safe,
or anywhere between these extremes, according to the kind of ore
received and the precautions observed. The danger of handling ore
depends chiefly on its dustiness, but also partly upon the chemical
nature of the ore, for some compounds of lead are more soluble than
others in the fluids of the body.
The ore of the Missouri and Illinois smelters is chiefly sulphide ore,
but farther west larger or smaller quantities of oxides and carbonates
are also smelted, both of which are more soluble and poisonous than the
sulphide. Usually these ores reach the plant in a decidedly moist
condition, and the work of unloading ore cars is not at all dusty and
therefore involves but little danger.
After the ore has been stored for some time, it may become very
dry and dusty. The mill in which the ore is crushed, sifted, and
mixed with other ingredients is almost without exception a very
dusty place, and mill hands get lead poisoning very frequently.
The danger here is from dust and is greater or less according to the
chemical nature of the ore and according to the care exercised in
handling it. Attached to the crushing mill is the sampling mill where
samples of ore are ground fine for analysis. This place must be kept
clean, because if dust were allowed to blow about no sample would be
pure. However, although no accumulations are allowed on floor or
table, the small mills and sieves and the iron plates (known as bucking
boards) must be cleaned after each sample and this is done by shaking
and by brushing off the dust with a dry brush. This dust has been
ground as fine as possible and sometimes the air of the room is quite
cloudy with it. The sampling room is generally recognized as a
fairly dangerous place to work in.
The ground ore, more or less dry, goes through many processes of
roasting and smelting which will be described in detail in the body of
this report. In these processes the risk to the men comes from the
handling of dusty lead compounds and from the fumes which escape
when lead or lead ores are heated. Melted lead is not dangerous as
long as it is kept below a dull red heat,1 but at this point fumes begin
to be formed and in roasting and smelting it is raised to temperatures
far above this. The men who transport the ore and the roasted
1 The exact point at which lead fumes begin to form and escape has been determined b y L . Lewin (Zeitschrift fur Hygiene und Infektionskrankheiten, 1912, vol. 73, p. 154) to be between 850° and 900° C. (1,562°
to 1,652° F .) for pure lead and at 750° to 800° C. (1,382° to 1,472° F .) for lead with as much as 5 per cent
zinc in the mixture.




8

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

products and who charge the furnaces are exposed to dust chiefly
but more or less to fumes also. The men who tend and discharge
furnaces are exposed especially to fumes.
In a refinery the processes are essentially like those used in smelt­
ing, for the b}^-products of refineries must be smelted and so must the
lead scrap and dross which is worked up in many of them.
Throughout the process of roasting and smelting, fumes are evolved
which contain enough volatile lead compounds, chiefly oxides and
sulphates, to make their recovery economically desirable. As a
consequence of this, an elaborate system is usually provided of steel
and brick flues, dust chambers, and bag houses. The flue dust which
collects is very fine and powdery and rich in soluble lead salts, and
if the ore smelted contains arsenic this also is found in the flue dust.
Flues must be cleaned out at intervals, sometimes once a month,
sometimes only once a year. The bag house contains long bags of
wool or cotton suspended from the roof and fastened over holes in
the floor. The lightest of the flue dust passes into the tops of these
bags, being drawn in by suction, and is deposited there. Then the
bags must be shaken at least once daily to make the dust fall. In
some plants men are obliged to go in every day and shake them by
hand, in others they simply work a handle from outside which does
the same thing mechanically. In two plants the air current is
reversed and a vacuum created, which makes the bags collapse and
shakes the dust into the dust chamber below. This dust chamber
also must be cleaned out at intervals. Flue dust is very dangerous to
handle, especially in those plants which smelt ore containing large
quantities of arsenic.
Always the flue and bag-house work is regarded as about the most
dangerous in the plant and always some effort is made to protect the
men doing it, but the degree of effort made varies widely. In some
plants care, the lavish use of water, and the introduction of mechan­
ical devices have done a great deal to lessen the danger of the work,
but there are others in which the manager seems content to admit
that it is a bad job and to rush it through as fast as possible, employ­
ing his least useful men on the work. One of these managers stated
in confidence that his annual flue cleaning in January, 1913, resulted
in the poisoning of 40 men. His whole regular force in the smelter
numbers only 350 men.
There are several processes in smelting and refining which are
attended with little if any risk to health, provided ordinary cleanliness
is observed and provided the work is not carried on in close proximity
to fumes and dust from other processes. Therefore a well-managed
plant will have several fairly safe departments and the dangerous
departments will be strictly supervised and the men carefully watched.
In a carelessly managed plant all departments may be dangerous to
work in.




LEAD POISONING IN SMELTING AND REFINING LEAD.

9

DUST AND FUMES.

Most of the plants visited are fairly new and some are of very recent
construction. The buildings of the more modern ones are large and
high, well supplied with natural ventilation, if indeed they are not
too open, and with ample space so that there is no crowding. The
introduction of machinery to take the place of hand labor is general,
and there is an increasing effort to save the lead fumes, which, when
they are allowed to escape into the air, are the most potent cause
of lead poisoning among the workmen. Even in the old plants,
dark and crowded and dirty as they are, there is some evidence of
recent improvements, and in some instances the old plant is being
abandoned for one of modern construction. On the whole, it is
certainly true that conditions are continually improving in this
industry. However, there is not one plant in which no fumes are
allowed to escape, not one in which there is a complete system of
hoods and exhaust ventilation. Nor is there one plant which is kept
as free from dust as it might be. The majority have at least one or
two inexcusably dusty departments and some plants have hardly a
single clean place. In both these respects, fume prevention and dust
prevention, American smelting plants leave much to be desired. Yet
it is dust and fume that are responsible for the great majority of cases
of industrial plumbism, and their control should be a simple matter
compared to the complicated engineering problems which have been
successfully solved by smelting experts.
In a refinery there are special dangers which are not encountered
in a smelter, and which come from the nature of the material worked
up in a refinery. To a certain extent this is clean bullion from a
smelter, and that, of course, is safe enough to handle, but many
refineries work up, aside from the bullion, quantities of scrap lead
and some work up nothing else. This stuff is handled much more
carelessly than ore or concentrates, and as a usual thing such a
refinery is a very dirty place, the most dangerous and dusty materials
being shoveled and dumped without the least precaution. The mere
fact that smelting is not done on so large a scale seems in the smaller
refineries to lead to carelessness in the matter of fumes as well as of
dust, and the only smelting furnaces found with absolutely no pro­
vision for protection against fumes were in refineries.
It must not be forgotten that, in addition to the evils of dust and
fume, men working in lead smelters and refineries are subject to
extreme heat and to rapid changes of temperature, while at the same
time their work calls for great physical exertion. This is not true of
all the men employed, but it is true of a far larger proportion than is
the case in such industries as the making of white lead, the glazing of
pottery and tiles, or the painter’s trade. Smelting resembles more
closely the enameling of sanitary ironware, for there also the men



10

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

are exposed to lead-laden dust, to great heat, and great exertion. It
is worth noticing that among these enamelers the incidence of lead
poisoning was found to be about 21 per hundred. In smelting, all
the furnace men and their helpers are exposed to great heat and to
rapid cooling off. x^s to overexertion, Sommerfeld 1 says that physi­
cal overstrain is a decided factor in smelting work, especially in
unloading ore, transporting ore, charging furnaces, breaking up
roasted ore, repairing and cleaning furnaces, loading bullion on cars,
etc. Not only the arms, but the muscles of the back and shoulders
are used to their utmost. Physical fatigue is one of the predisposing
causes to plumbism.
The managers and superintendents of these smelters and refineries
appreciate the danger of lead dust and fumes. Indeed, there is a much
more intelligent attitude toward the hygienic problems of this industry
among the men in charge than is found in some of the lead industries,
but there is too much insistence upon the responsibility of the work'
man for his personal cleanliness and too little on the responsibility of
the management for the conditions under which the man works. As
we shall see further on, bodily cleanliness is not nearly so important
an item in the prevention of lead poisoning in the smelting industry
as it is in the white-lead industry, or in the making of red lead or
storage batteries, or in pottery glazing, where the men handle and are
smeared with soluble lead salts. Hand and face washing and bathing
are absolutely essential in those industries to prevent the men carrying
large quantities of poisonous lead into their mouths with food or
tobacco, but the amount of soluble lead that clings to the smelterman’s hands is relatively small. In this trade, as in sanitary-ware
enameling, it is dust that is the dangerous element, and under dust is
included the excessively fine suspension of poisonous lead salts which
make up the fumes from heated lead and lead ores. If all the lead
which sticks to the hands and face and bod}" of a smelter employee
at the end of his day’s work should in some way reach his mouth and
be swallowed—practically, of course, this could not occur—it would
not equal in amount what he breathes in if he is working in an atmos­
phere of lead fumes.2
In spite of the admitted danger from dust and fumes, foremen and
physicians often explain the frequency of lead poisoning in a smelting
plant on the ground of the men’s carelessness in washing, and one
often hears them say that if a man does not use a nailbrush when he
washes his hands the lead which has gotten in under his nails will
poison the food he handles. Now, it is certainly difficult to see how
such a thing could take place, or how even with the greatest careless­
ness the lead on the back of the man’s hands could possibly poison his
food. This does not mean that eating food with unwashed hands
1 Leym ann’s Bekampfung der Blelgefahr In der Industrie, p. 40.




Jena, 1908.

LEAD POISONING IN SMELTING AND REFINING LEAD.

11

should be permitted. It is of course dangerous, yet curiously enough
the superintendents and physicians who insist most upon this danger
are the ones who have provided practically no washing facilities for
their workmen.
SANITARY EQUIPMENT.

Compared with the prevention of dust and fume, the provision in
this industry of good wash rooms, shower baths, and lunch rooms is
of minor importance, but it is important enough to make it a matter
for surprise when we find that out of these 20 plants only 8 had at the
time of this inspection an equipment which was at all adequate and
that 3 of these are in Illinois where the law requires it. A striking
instance of carelessness is the keeping of drinking water in open
buckets, which, although an obviously dangerous practice, is not
uncommon.
MEDICAL CARE.

All of the plants covered in this study employ physicians to attend
cases of illness as well as of accidental injuries among the men.
The service rendered by these physicians may be classed as good in
the majority of cases; indifferent in some instances; poor in a few.
The insurance system, by which the worker secures the right to
medical treatment, varies somewhat in the different plants; but,
except in two cases, the doctor is always chosen and appointed by the
management and holds his position at its pleasure. In the two
exceptional places, the men have a voice in deciding whether or not
the physician is rendering good service and whether or not he shall
continue to serve; but in 15 plants, though the physician is paid
wholly or in greater part through sums deducted from their wages,
they have no share in either his selection or retention. The plants in
Illinois bear all the expense of medical and hospital care and do not
charge the men anything. This is in accordance with the Illinois law.
The details of the insurance systems followed in different plants
are given later. In general, it may be said that with a very few
exceptions the expenses of sickness and accident are borne in large
part, if not entirely, by the workmen, who have, however, no voice in
saying how the money shall be expended and no means of redress if
the medical care furnished is insufficient or indeed worthless.
DISADVANTAGES OF A SHIFTING FORCE.

The men employed in this industry are for the most part of foreign
birth, with a varying proportion of American born, who usually hold
the more highly skilled positions. The work is for the most part
unskilled or at the most semiskilled.
It is a shifting class of labor everywhere, excessively so in New
Jersey, perhaps a little better in the Middle West, and still better in



12

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

the West, hut unsatisfactory everywhere. A certain amount of
seasonal shifting is p rob a b ly good for the men. In the spring, large
numbers of them leave the smelter to take work on farms or beet fields
or in railway construction and road work, coming back after four or
five months decidedly benefited by this change to healthful outdoor
work. Still it remains true on the whole that the more shifting the
force, the greater the amount of lead poisoning. A new lot of men
means a certain proportion of oversusceptible ones who can not, be
weeded out until they have demonstrated their susceptibility by an
attack of acute poisoning. It also means awkward, bungling work,
which results in the clogging of flues, the escape of fumes from im­
properly managed exhausts, injury to furnaces requiring repairs— in
short, danger to fellow workmen as well as to the man himself. Repair
work in a lead smelter is always dangerous because it always involves
dust, and the more the foxxe shifts the more repairs are needed.
Then, too, it is impossible to expect that a foreman will take much
pains in teaching his men how to avoid the dangers of the work if he
lias to instruct a fresh gang every month.
Lead smelting in the United States has one good feature not found in
the industry in foreign countries: It does not employ boys or very
young men. In Austria and Germany, it is evident that men under
20 are frequently employed in such work. Thus, in the model
German smelting plant, the Friedrichshutte (together with the Walter
Croneckhutte) in 1911 there were 132 men under the age of 20 out of a
force of 803.
It is not hard to see why labor shifts so much in this industry for
the wages paid are low,1 the work is heavy and dangerous to health,
the heat exhausting, and the sulphur fumes very disagreeable. Hours
are not excessive. Three shifts of eight hours each are the rule every­
where except in and near Chicago, and contract work makes possible
an even shorter day for men engaged in certain tasks. On the other
hand, a seven-day week is universal.
PREVALENCE OF LEAD POISONING IN THE INDUSTRY.

There are no sources from which can be gathered full data as to the
prevalence of lead poisoning in this industry and though an effort was
made to ascertain the facts from hospital records and from interviews
with physicians, druggists, priests, and workmen and their relatives,
it has been impossible to get more than a partial estimate of the num­
ber of smelter employees who fall victims to industrial plumbism every
year. Physicians can rarely give actual lists of cases, and it is unsafe
to accept general statements as to the number of cases seen yearly by
them, because some of the men might have visited more than one phy­
sician, and in the end, have gone to a hospital, so that the same case




J See p. 70.

LEAD POISONING IN SMELTING AND REFINING LEAD.

13

might be counted more than once. The list has therefore been lim­
ited to individual cases gathered from hospital records, from the writ­
ten notes of doctors, and from the statements of the men themselves.
From these sources 1,769 cases of lead poisoning were found that
had occurred in 19 lead smelting and refining plants during the year
1912. The twentieth, a newly erected refinery, had not been in opera­
tion long enough for cases of poisoning to develop among its 100
men. These 19 factories employ about 7,400 men, that is, 7,400
represents the sum of their average daily pay rolls. It does not
represent the actual number of men who have entered and left, or
still remain in the employ of these 19 plants.
The cases of lead poisoning were secured from the following sources:
Hospitals, 347; physicians’ records, 1,320; reported by laymen, 102.
If it is considered safer to exclude those which came from non­
medical sources, we shall have 1,667 cases among 7,400 men, or a
little more than 22 for every 100 employed. The hospital cases alo.ne
give a rate of almost 5 in 100 employed, which, is larger than the
rate in Great Britain for all cases/ but these 347 men from the
hospital records belong to only 9 of the 19 plants. The other 10
plants furnished no hospital records at all.
It may be objected here that the statement above as to the large
numbers of men who pass in and out of the trade every year shows
that many more than 7,500 were employed in the lead smelting in
1912. This is true, but it is obvious that it would be unfair to count
all the men who enter and leave the industry, no matter how short
their stay. An experience of a few days should not count in the
same way as an experience of months. Were we to attempt such an
estimate as that, a badly-managed plant with men coming and going
might show a lower rate of lead poisoning than a well-managed plant
with a steady force.
Moreover, it is also true that 1,769 does not nearly represent the
full number of cases of lead poisoning that occurred in 1912. Only 2
of the 20 plants have a full medical record to show; in others the
record was only partially complete, in still others only the scantiest
information was available, and in 4 plants no information at all could
be obtained. To take a few instances: 1 smelter employing 275 men
and another employing 250 men had records of the hospital cases only.
Naturally, many sick men prefer not to go to the hospital, especially
if they are married and have their own homes. In another case— a
large refinery employing 650 men—the physician refused to give any
- information or to allow inspection of the records of the hospital to
which the company sends its sick workmen. All that could be learned
of the situation was gained from the records of two outside physicians,
who had seen some 120 cases in the course of the year. It is evident




1 See p. 54.

14

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

that this was only a small proportion of the men actually poisoned,
for all the workers were paying $1 a month to the company’s sickness
insurance fund, and the greatest number of them would certainly go
to the doctor for whose services they had already paid.
It might be supposed that the Illinois smelters would have furnished
full and satisfactory reports, since the law requiring a monthly
medical inspection of all employees and a report of the cases of lead
poisoning to the chief factory inspector’s office went into effect more
than two years ago. As will be seen later, however, this source of
information has failed completely in the case of the three largest
Illinois plants, owing to an unwillingness on the part of the doctors to
send in full reports.
Considering how little information it was possible to obtain in many
of the plants, it does not seem an exaggeration to say that the num­
ber of cases found falls far below the truth, and that the record for the
smelting industry in the United States for one year is at least 1,657
(or 1,769) men poisoned among 7,400 employed.
PREVENTION OF LEAD POISONING IN THE SMELTING INDUSTRY.

The statistics of the British factory-inspection office and those from
one or two plants in Germany and Austria show that lead smelting
can be carried on without as much danger to health as exists at
present in American smelting plants. To understand where the fault
lies, one must study the methods used in the United States and see
where the avoidable dangers are to be found. An admirable standard
for the sanitary conduct of this industry may be found in the wrork of
the late Richard Muller,1 which was published in 1908 and awarded a
prize by the International Association for Labor Legislation. Muller
was not a physician, but an engineer, who had nineteen years’ expe­
rience in the management of a large smelting and refining works, the
Emser Blei und Silberhutten. He speaks, therefore, not as a theorist,
but as a man who has tried out the measures he advocates. He has
learned by experiment where the dangers in this industrylie, and how
they can be controlled without detriment to the practical working of
the plant and without increasing the cost of the output.
Muller emphasizes the danger from dust in transporting, grinding,
and sifting leady substances, charging furnaces, repairing, sweeping,
cleaning out flues, etc., and the danger from fumes whenever lead is
melted. u Every shop superintendent should look upon any quan­
tity of lead dust or fume as potentially dangerous, and should rather
run the risk of doing too much to guard against it than of doing too
little.” He holds the management almost entirely responsible, for
though most workmen are careless and disobedient, their carelessness
1 Die Bekampfung der Bleigefahr in Bleihiitten.




Rich. Muller, Jena, 1908.

LEAD POISONING IN SMELTING AND REFINING LEAD.

15

and disobedience can give rise only to occasional cases of lead poi­
soning. If a plant has repeated trouble, a continual succession of
cases of lead poisoning, then it is the surroundings under which the
men work that are at fault.
According to Muller, a smelter or refinery can be made so free from
poisonous lead that only the oversusceptible will run the risk of be­
coming poisoned. The two essentials in such a plant are cleanliness
and forced ventilation. These are the principles of construction and
maintenance that he lays down.
CONSTRUCTION.

The character of the building has an influence on the conduct of
the men, for dark, low-ceiled rooms do not inspire ideas of cleanliness.
The buildings must be very roomy, light, well ventilated, the walls
clean, and the floors smooth and hard. The walls should be white­
washed at short intervals, partly for the effect on the men, partly
because that is much the safest way of getting rid of the dust. As to
ventilation, it must be ample, but one must not depend on windows
and doorways to carry off fumes. On the contrary, a too open con­
struction admits wind and drafts which disturb the exhaust system.
Flues will work well only when the air inside is warm, and they are
incapacitated by drafts of cold air. A plant with very open con­
struction may have more fumes and dust than one which is better
inclosed.
SANITARY EQUIPMENT.

Proper washing facilities, including warm water, soap, and towels,
as well as a clean lunch room, should be provided for the men and
their use made obligatory, but Muller believes that ordinary soap
and the usual methods of hand and face washing are quite sufficient,
and that it is foolish to insist on elaborate scrubbing and the removal
of the last particle of dust deep in the folds of the skin. Lead which
will not come off by ordinary washing with soap will hardly poison
the man’s food no matter how he handles it, and 11personal cleanliness
on the part of the workmen is not nearly as important as cleanliness
of the shop.” He has seen plants with fine bathhouses and model
workmen’s homes which had failed to reduce their rate of industrial
plumbism because dust and fumes still persisted in the works.
The lunch boxes brought to the works should be kept in the lunch
room, though this is hardly a matter of real importance. Far more
important is it to see that the drinking water is not kept in open pails.
Bathing facilities are desirable, chiefly because they train the men in
habits of bodily cleanliness. Muller thinks that only insignificant
quantities of dust cling to the bodies of men employed in a wellmanaged smelter, and that two baths a week are quite enough. For
flue dust men, however, daily baths should be compulsory.



16

BULLETIN OF THE BUREAU OF LABOR STATISTICS.
BUST PREVENTION.

Dust must be prevented by dampness, by sprinkling; there is no
other possible way. Where material can not be handled wet, exhaust
ventilation must be installed, but such work must always be regarded
as dangerous and must be carefully supervised; only strong and welltested men should be employed there. But in almost every part of
the work, dusty products can and should be dampened, and for this
purpose an abundant and easily managed water supply is essential.
Floors should be sprinkled so often that they will be always a little
damp and dry sweeping should be absolutely forbidden.
PREVENTION OF FUMES.

All fumes should be carried off by exhaust ventilation, for the least
escape of fumes is dangerous, and natural ventilation is too variable
and uncertain. It must be remembered, however, that no exhaust
system will render safe a furnace which is always getting out of order.
Neither against dust nor against fumes can one trust to the pro­
tection of respirators. Anyone who has ever worked with filters and
has tried to drive air through and keep dust back knows how thick a
filter and how strong a force is required. It is impossible for a work­
man to get enough air through a really effective dust filtering respi­
rator. Like the British factory inspection department, Muller prefers
to a respirator a simple muslin bag tied over the mouth and nose and
washed daily.
CONTROL OF THE W ORKM EN.

Discipline should be inflexible; half-hearted cooperation on the
part of foremen is fatal to any system. )All protective devices should
be so arranged that the men will have more trouble in getting them
out of the way than in using them, for it is impossible to make the
whole force reasonably careful. Every increase in the force or change
in the personnel increases the danger of lead poisoning, for new men
may prove oversusceptible and may sicken under conditions not
dangerous to ordinary men. Emergencies and accidents are frequent
in lead smelting and always involve risk, but with a healthy lot of
men a certain amount of risk can be encountered without harm, while
if there are oversusceptible men they will succumb. No man who
has been once leaded should be employed in the worst kinds of work.
MEDICAL SUPERVISION.

Like most practical men, Muller does not rate very high the advice
which is given by medical experts. He advises superintendents to
do their own inspecting and to insist on a report from the foreman as
to pallor and loss of appetite among the men. Two very thorough
medical inspections in a year would, he believes, be of more value
than 12 superficial monthly examinations.



LEAD POISONING IN SMELTING AND REFINING LEAD.

17

To sum up, the prevention of lead poisoning is in the hands of the
superintendent. uThe workmen can be blamed only after all that
is possible in the way of cleanliness has been carried out in the plant. ” 1
PROCESSES USED IN LEAD SMELTING AND
THE UNITED STATES.

REFINING IN

HANDLING THE ORE.

Lead ore from the mines must be first crushed and screened to the
proper size for roasting and smelting. Sometimes this is done at
the mine and the ore which comes to the smelter is in the form of
concentrates, chemically unchanged but in shape for roasting or
smelting. In the Western States the grinding is done at the smelter.
The ores from these States contain lead sulphide, sulphate, oxides
and carbonate. Missouri ore is almost all sulphide, galena, though
it is doubtful if any smelting plant, even those in the Mississippi
Valley, handles exclusively sulphide ore. There is almost invariably
some so-called “ scrap” smelted also and in some smelters and in
almost all refineries scrap is a very important element. This scrap
is lead refuse of all kinds and dangerous to handle, the danger in­
creasing in proportion to the dustiness.
The sulphide of lead has been generally held by ph}rsiologists to
be quite insoluble in the human body and therefore free from poison­
ous effects. It has been stated to be the one compound of lead
which has no effect when taken into the stomach. Practical smelt­
ing experts, however, receive this statement with some skepticism'
Muller reports a case of lead poisoning in a man who had been exposed
to sulphide ore only, and experts in this country state that they
have had no reason to believe this ore harmless, though long ex­
posure is usually necessary before poisoning takes place. Our belief
in the harmlessness of galena was shaken when it was discovered
that during the year 1912, 25 cases of lead poisoning had been
treated in the Alexian Brothers hospital in St. Louis and that the
men, all foreigners, had come from the lead belt of southeastern
Missouri, from Desloge chiefly, though a few came from Bonne
Terre and Flat River. There is but one small smelter at Desloge,
none in the other places. An investigator sent to the spot reported
that though he could not trace the individual cases, inasmuch as
about 1,000 foreigners are employed in the mines of the Desloge dis­
trict, he was able to make sure that none of them had been employed
in the smelter, for the workmen there were all Americans and knew
each other. Bonne Terre and Flat River have concentrating mills
1 For regulations adopted in Germany and France for the control of the lead-smelting industry see Appen­
dixes III and IV , pp. 88 to 94.

31080°— Bull. 141— 14------ 2




18

BULLETIN OF THE BUREAU OF LABOR STATISTICS,

but no smelting. These 25 cases of lead poisoning were serious
enough to require hospital care and among them was 1 case of
palsy and 1 of lead ps}rchosis.
It was evident, then, that the lead poisoning had been contracted
in the course of work in mines or concentrating mills where sulphide
ore only is handled, and it was evident also that a long exposure is
not always necessary, for these men were not a permanent body of
employees but migratory, not staying long enough to be really known
in the community.
To clear up this question of the solubility of lead sulphide it was
suggested to Dr. Carlson and Dr. Woelfel, of the Physiological De­
partment of the University of Chicago, that they subject these ores
to laboratory tests, using for the purpose human gastric juice which
they were able to procure from a case of gastric fistula. Similar
experiments on the solubility of the basic carbonate and the basic
sulphate of lead had already been made by these investigators and
are reported in Bulletin No. 120 of the Bureau of Labor Statistics,
pages 22 to 32.
The account of their experiments is given in the appendix.1 It
will be enough to state here that they showed the sulphide in galena
ores to be soluble in the human gastric juice and therefore poisonous.
To the objection that the lead in the ore may not all have been in
the form of sulphide we may point to their report on the solubility
of chemically pure lead sulphide, which they found to be even greater.
This is in accord with the experience of Etz,2 who found precipitated
lead sulphide more soluble than galena.
In a plant where the ore concentrates arrive in the cars in a damp
condition, as is almost always the case, the work of the unloading
gang is free from risk. It is later on, after the ore has been stored
for some time, that it may have grown dry and dusty and a good
deal of trouble may come if it is shoveled and dumped without
sprinkling down the dust. In one smelter where this is done six
men went to the doctor with lead poisoning within two months, all
of them having been engaged in handling ore.
Much worse than in any smelter is the condition in the corre­
sponding department in a refinery, for all refineries handle more or
less dross and scrap and some of them make a specialty of just this
sort of work. This means that the storage bins are filled with very
poisonous lead refuse, white lead and red lead, the dusty fragments
of old storage batteries and dusty dross skimmings, material which
is dangerous to unload, to transport, to mix, and to charge into
furnaces. Four of the older refineries have stuff of this sort piled
up all over the place, so that hardly one room is clean and safe.




1 See A ppen dix I, p. 82 to 84.
2Leym ann, B ekam pfung der Bleigefahr in der Industrie, p. 4, Jena, 1903.

B u lle tin No. 141— Labor.

P L A T E 1.— S A M P L IN G M IL L .
The ground ore comes down th is chute and fa lls into th e hopper. T h e re is no protection
aga in st th e d u st w hich flie s everyw here, fa llin g on the belts and being scattered
thro u gh th e room.




LEAD POISONING IN SMELTING AND REFINING LEAD.

19

CRUSHING A N D SAMPLING MILLS,

These are almost always poorly constructed buildings with old,
rough, dirty wooden floors, with accumulations of ground ore in the
corners or sometimes covering the whole floor. Still finer dust clings
to the walls and all projecting surfaces, arid the air is often so dust
laden, that after a couple of minutes’ exposure the leaf of one’s note­
book is quite gritty with dust. In many places the crushed ore is
arried to the ore beds or weighing hoppers by a traveling belt which
usually passes uninclosed through the building and lets quantities
of dust spill as it passes along. The illustration (plate 1) shows
another method, which is equally detrimental. Crushers and screens
le*>k, chutes are open, the ore shoveled in at the dump is often much
urier than it should be, and the ground product of the mills is often
discharged in such a way as to allow clouds of dust to escape. It
would seem as if prevention of such conditions were simply a ques­
tion of care and attention, not of elaborate and expensive mechanical
devices, but in the absence of ordinary care the mill which is crush­
ing anything but sulphide ore is a dangerous place. The excuse for
leaving everything open is said to be the danger of clogging, which
necessitates getting at the mechanism easily .
A description of two mills will serve to illustrate the difference that
attention to cleanliness may make.
No. ‘20. The ore here is largely sulphide from the Cceur d’Alene
itrict. There are two mills— an old one in which matte was being
ished, and a new one which was crushing ore. The old building
_^d old wooden floors, but they were clean. No dust was percep­
tible in the air and very little on projecting surfaces, a fact which
ras explained by the well-inclosed crushers and the installation of
a spray above the discharge to the traveling belt, which served to
dampen the ore as it left the crusher. The new building is better
constructed with a clean cement floor, but there was more fine dust
here on projecting surfaces, perhaps because ore grinding is dustier
than matte grinding. There is a separate lunch room connected with
this building and the men were lunching there at the time. Near it
was a very well-equipped wash room, with accommodations for 14
men. It was provided with soap machines, paper towels, good
basins, and hot and cold water.
No. 15. The ore handled here is two-thirds sulphide and one-third
oxidized ore, with about 5 per cent pure carbonate. The mill was
excessively dusty. The manager said that as samples of the ore are
taken at once for analysis, all the ore could be dampened and none
need be handled dry, but all that was seen going into the crushers
during this visit was quite dry. The air in the first floor of the mill
was so thick with dust that one could feel the particles in one’s
mouth, and clothes and notebook were powdered in a few minutes.



20

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

Most of it came in puffs and showers from the traveling belt. Heaps
of dust lay in corners, though the center of the room had been swept
and was damp at the time. The second story was also dusty, but
not as bad as the first. There are no washing facilities at all in this
mill and no lunch room.
The “ plate room /’ where samples for analysis are mixed, is always
scrupulously clean, because if dust were allowed to blow about, the
different specimens of the ore would become mixed and great inac­
curacies might result. The process of mixing and separating out
the sample, which is done on a floor covered with smooth iron plates,
is quite free from dust. Then this sample goes to the “ bucking
room /’ where it is ground in small mills, sifted by hand, and usually
ground to extreme fineness on an iron “ bucking plate” by means of
a long-handled hammer with a large and heavy flat piece of iron at
the end, which is known as the “ bucker.” The finely ground sam­
ples are mixed thoroughly in tumbling boxes or by tossing the
powder to and fro on a piece of oilcloth.
Most sample mills leak more or less while they are grinding, and
there is always an escape of dust while the powder is being poured in
or taken out. There is some dust from bucking and from mixing
and there is a good deal of very fine dust when the bucking boards,
tumbling boxes, and mills are brushed clean to prepare for a new
sample. Conditions are so nearly equal in all the sample mills seen
that it is needless to describe specific instances. The danger from
the dust varies according to the nature of the ore that has been
ground and sifted.
In an ore sampling mill for western ores the average monthly pay
roll is 30 men. The physician’s report for this plant was as follows:
October, 1912, no cases of lead poisoning; November, 4 cases; Decem­
ber, 7; January, 1913, 4; February, 3; March, 1; April, 1; May, 2;
June, 2; July, none; August, 2; September, 1; total, 27 cases in one
year.
TRANSPORTING GROUND ORE.

Before being smelted, ores of different compositions are mixed,
the purpose being to secure a compound containing chemical elements
which will react upon one another in such a way as to facilitate the
smelting process. A “ charge” or mass of ore prepared for smelting
must contain these different ingredients in a certain fixed proportion,
otherwise it will not smelt properly. Mixing the charge is an impor­
tant part of the preparatory processes.
There is a great deal of difference in the way the crushed ore is
handled between mill and furnace and consequently in the amount
of dust to which the workers are exposed. In one plant all the ore
was decidedly wet at the time of inspection. The ore beds are out
in the open with clean, damp cement walks between the two rows



LEAD POISONING--IN SMELTING AND REFINING LfiAD.

21

of beds; trapdoors through which the ore is dropped to a car below
are placed at intervals, thus making a very safe and clean method
of loading. In another plant the separate ingredients for the charge
are placed in weighing hoppers in a damp condition and discharged
from the bottom of these hoppers on to a traveling belt. This also
is an excellent and safe arrangement because everything is kept damp
and there is no dust either at the discharge from the hoppers, or at
the cylinders where the mixing is done, or at the discharge from the
cylinders. A similar arrangement in another plant, however, is
inexcusably dusty because of careless management. Here the air
was clouded with fine dust and every projecting surface was thickly
covered with it. The place looked as if it had never been cleaned.
The dry ingredients for the charge drop from large weighing hopper's
to the belt, which discharges them at a dump leading to the mixer, a
large hole in the floor covered with a grate. Here a man was stationed
to control the discharge and rake and push it through the grate.
The whole place was enveloped in clouds of dust. This man was
interviewed later and said that he was quitting because the familiar
symptoms of lead poisoning had begun to appear and he recognized
them, as he had been leaded before. He also said that all of the five
men who had previously held this job had left for the same reason.
A very excellent arrangement was seen in a fourth plant where
by an ingenious device some discarded Bruckner cylinders have been
converted into receptacles for ore and for the other ingredients needed
in the furnace charges. Weighing hoppers regulate the discharge
of these ingredients to a traveling belt which passes under them.
The process is free from dust and practically automatic.
SMELTING.

After the ores have been ground and mixed, they are ready for the
furnace processes. There are three groups of these: (1) Roasting,
preroasting, and sintering; (2) reduction or smelting proper; (3)
refining processes, such as drossing, desilvering, and the like. The
purpose of roasting is to drive off sulphur, antimony, and arsenic,
or any other ingredients which are either volatile in the first place
or are rendered so by a preliminary heating. The oxidized mixture
thus obtained is then ready for smelting, after which the refining
processes are used to free the lead from all traces of the other metals
which may have been mixed with it in the ore.
Ordinarily these three processes are quite distinct, a separate fur­
nace or group of furnaces being used for each. In the case of simple
lead compounds, like galena, the roasting and smelting may be com­
bined in one operation, for which only one furnace, either an open
hearth or a reverberatory furnace is used. More commonly, however,



22

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

roasting is carried 011 in one or more furnaces designed for this use
only.
In the course of the present investigation, the following furnaces
were found in use, divided as indicated among the three groups of
processes:
I. Preparatory roasting:

Hand-rabbled reverberatory furnaces.
Mechanical preroasters—
Godfrey furnace.
Holthoff furnace.
Wedge furnace.
Roasting and sintering furnaces—
Huntington-Heberlein pots.
Dwight-Lloyd machines.
II. Smelting processes:
Open or Scotch hearth (combines roasting and smelting).
Hand-rabbled reverberatory furnace (combines roasting and smelting, but is
almost obsolete).
Blast furnace, with, in some cases, a settling furnace in addition.
III. Refining processes:
Softening and refining furnaces.
Drossing, remelting, and desilvering furnaces.
By-product furnaces.
Retorting and cupelling furnaces.
Liquating furnaces.

The technical details in the following description of the different
furnaces used in lead smelting and refining in the United States were
prepared by H. B. Pulsifer, of the Armour Institute, Chicago. His
description is supplemented by specific instances seen in the course
.of this investigation.
FURNACES USED IN LEAD SMELTING AND REFINING IN THE UNITED
STATES.

At the present time a great variety of furnaces exist in the lead
industry as practiced in the 20 plants which form the subject of this
study.
In the preparation of the ores and intermediate products for actual
reduction the old hand-rabbled reverberatory is still used to a slight
extent, in particular for roasting lead mattes. The Bruckner cylinder,
which for a very few years flourished as an improvement on rever­
beratory roasting, has disappeared entirely. The HuntingtonHeberlein process of pot roasting, the next roasting innovation after
the Bruckner, is still largely used side by side with the more recent
innovations. The Midvale converters are a mere variation of this
process and, hygienically considered, are practically the same thing.
A method which is coming into general use now for preparing ore
for the blast furnace is down-draft, sinter-roasting by means of the
Dwight-Lloyd machines. For preroasting the Godfrey or Holthoff



B u lle tin No. 141— Labor.

P L A T E 2.—O R E H E A R T H OR SC O TC H H E A R T H .
T h is is protected by a double hood, th e fla rin g o u te r hood com ing o ver th e w o rk plate,
b u t not o ve r th e lead w e ll, to th e righ t, nor th e ca r fo r gray slag, to th e le ft.
The photograph was taken purposely d u rin g an in te rva l when th e re was no slag on
th e w o rk plate, so th a tfu rr.e s w ould not obscure th e view .




LEAD POISONING IN SMELTING AND REFINING LEAD.

23

furnaces are commonly used, but Wedge furnaces, patterned on
those used in copper smelting, are being introduced.
In the actual reduction of the ores to metallic lead the ore hearth,
first used in England about the middle of the seventeenth century, is
even to-day used on a large scale and with only little change in
furnace construction. The reverberatory furnace, whose climax
came about a century ago in England, is all but extinct with us now,
only a couple of furnaces being in use in just one plant. The blast
furnace is our main device for winning metallic lead; it has had a
great development and appears firmly fixed in its preeminent position.
In the plants about the country we can find blast furnaces of every
capacity from 30 to 250 tons per 24 hours. The smaller of these
furnaces have not much increased capacity over furnaces used for
centuries, but their construction and operation show the result of the
general improvement in blast furnaces.
In the refining of the bullion made in the blast furnace quite a
variety of reverberatory furnaces exists. Softening and refining is
done in furnaces holding from 50 to 300 tons, both practically iden­
tical in construction. Reverberatory furnaces are also used for
liquating and for working up matte and antimonial slags. Fabre
du Faur tilting furnaces (retorts) are used to distill the zinc from the
silver crusts; the American modification of the English cupellation
furnace is widely used to win the dor6 (silver and gold) from the
rich lead. Large, open cast-iron kettles are commonly used for
remelting, drossing, and desilvering.
The degree of danger to which the worker is exposed differs materi­
ally according to the furnace at which he works and to the precau­
tions taken to safeguard him from dust and fumes. In the following
pages descriptions will be given of the furnaces seen in use, and of the
conditions actually prevailing in the plants visited.
ORE HEARTHS.

These furnaces, commonly known in America as Scotch or open
hearths and in Germany and Austria as American hearths, are con­
sidered first as being the oldest device and involving the simplest
process still in use for smelting lead.
The usual hearth is a cast-iron box, 4 feet long, 18 inches wide, and
1 foot deep; it rests on a base or legs with its top about waist high.
About the hearth box and resting on it is a three-sided water j acket,
also of cast iron, while above is always an inner hood to catch most
of the fume and in addition a broader, more spreading hood may be
placed over both men and box. (See plate 2.)
Two men work the hearth; they throw on the fine ore and coke
with a shovel; they stir the charge with pokers and toss the hot slag,
first out onto the work plate or apron, then into a receptacle at one



24

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

side (which may contain water) and drain out the melted lead into a
pot at the other side* Almost without intermission the work goes
on during the shift. Whenever the fire blazes up well through the
smoothed-off mass, the latter must be stirred and restirred and thrown
back, and more ore and coke added, and after a rest of a few seconds
the whole operation must be repeated.
The blast comes into the hearth through a row of holes in the back
just above the level of the lead which practically fills the box. Before
the lead quite overflows one of the men banks the channel at one
corner of the work apron and with his shovel pumps the lead up over
the edge so that it will run down into the side pot. A little coal fire
burns under this pot to keep the lead hot till enough has accumulated
for the helper to mold it into 100-pound bars. Such is smelting at
the ore hearth. One plant has 30 of these hearths, another has 24,
a third has 16.
The work is hard and hot for the hearth man and his helper. In
order to make full wages a man has to work assiduously. He has
to stand up to the flame and red hot charge and keep the hearth in
condition all the time, for it will not make even standard extraction
if at all neglected. In winter it is not so bad, but in summer no man
can stand it continuously for many days. Usually the work is di­
vided into three shifts of eight hours each and the piecework is paid
for on the assumption that the man is working eight hours. There
are no pauses for lunch; if the man stops he does it at his own loss.
If he wishes to wash his hands and sit down and eat his lunch, he
must do it knowing that the hearth will stop producing during that
time. Many do not eat at all while at work, especially if they are
troubled by the sickishly sweet taste of lead; others stop for a few
moments now and then to eat, but not to wash. It would be hard
to say which is worse, exposure to lead fumes with an empty stomach,
or eating lead soiled food.
About 50 per cent of the lead from the charge is recovered from
the ore hearth as metallic lead, about 35 per cent goes into the gray
slag and the rest into the fumes, which means that smoke from the
lead pot, the slag pot, and from the furnace itself are all rich in lead.
If there were only one hearth in a plant the men would get the fumes
from only that one, but with a row of hearths each man gets the smoke
from all the hearths. At every visit paid to an ore hearth building
the air was found to be cloudy with lead fumes. (See plate 3.)
A brief description may be given of two ore-hearth buildings. In the
first (No. 8) 180 men are employed in three shifts of eight hours each.
This does not include the unskilled laborer who brings the ore and
coke to the hearths and who is outside of the building more than he
is inside. The furnaces are built in a long row under a shed which
is open on three sides, supposedty for better ventilation. Over each



B u lle tin No. 141— Labor.




P L A T E 3.— O R E H E A R T H B U IL D IN G IN P A R T IA L O P E R A T IO N .
N ot all o f th e hearths w ere w o rk in g , b u t th e presence of fu m e s is e v id e n t enough.

LEAD POISONING IN SMELTING AND REFINING LEAD.

hearth is a double hood, the outer one projecting far over the hearth
and designed to catch all of the fumes from the work plate. Never­
theless the gusts of wind from outside drove some of the hearth fume
out into the room and all the dense white clouds which came from
the lead slag as it was thrown out into the skip car escaped into
the room. There is no water in this car. The manager does not
attempt to work the hearths for more than about 70 per cent of their
usual output in the summer months, for the men simply can not
endure the heat and exertion. The hearth men are said to earn
$3.50 to $3.75 a day, the helpers $2.50 to $3.
In spite of the fact that there is careful medical supervision of these
men, and that the ore-hearth men suspected of plumbism are sus­
pended from work by the doctor, the rate of lead poisoning is said
to be very high. The men are skilled workmen and earn higher
wages than they can at other work in the plant; consequently they
object very strongly to being shifted to safer departments, even con­
cealing their symptoms from the doctor as long as possible for fear
he will make them stop work.
No. 9. There are 24 open hearths in a long building, the sides of
which can be opened for ventilation, and also closed on windy days.
Each hearth has a hood with a strong exhaust, but not nearly all the
fume from the hearth passes up under it, and that from the slag
all escapes, because it is outside the edge of the hood. There is
more fume in the air here than in No. 8, because the hood is single
and not as wide nor effective. Another quite unnecessary source of
contamination of the air was seen in the openings into the Hues
through which the workmen can put their tools and clear out
accumulations of dust. In the intervals between cleanings these
holes are supposed to be kept closed, but at least three were open
at the time of the visit and sending out little white puffs of smoke*
Also in between pairs of furnaces there are hoppers attached to the
flues, in order to collect at once the heavier flue dust while the lighter
passes on to the bag house. Every day the “ nipple” of each hopper
is unscrewed and this dust allowed to fall into a truck below. This
adds lead dust to the lead fumes and increases the danger of work
at the furnaces. Negroes are employed here and both American and
foreign born whites. The force shifts surprisingly in spite of the
good wages paid. At a second visit to this plant, after an interval
of three years, the foreman pointed out as an “ old hand” a man
who had been there when the first visit was made. He and two others
were the only ones left of the men who had been there three years
ago.
All of the hearth men who were interviewed complained of the
heat, the fumes, and the driving pace. It is doubtful whether there
is any one piece of work in the smelting of lead which is as dangerous



26

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

to health as the ore-liearth work, unless it be the handling of flue
dust. Three of the 20 smelters visited use ore hearths, and as they
have in addition blast furnaces and large flue systems, it might nat­
urally be expected that they would have more serious trouble from
lead poisoning than the other 17 plants. This seems to be the case.
Concerning two of them, we have no accurate report to depend
upon, yet even with the very imperfect lists available, the number of
cases of serious plumbism is startling. In the third, a thorough
medical examination had been made of a part of the force just prior
to the inspection and the doctor’s records were freely shown.
Taking the cases discovered in all three plants we find that, as
compared with the average smelter, they have an undue proportion
of lead poisoning and especially of its severer forms.
P R O P O R T IO N OF E M P L O Y E E S A N D OF CASES OF PLU M B ISM IN 3 O R E -H E A R T H
P L A N T S AS C O M PA R E D W IT H T O T A L IN TH E 19 P L A N T S V IS IT E D IN TH E U N IT E D
STATE S.
[One new ly erected plant is not here included.j
Number of cases of—
Number
of fatal
cases.

Employees.
Plum b­
ism.

Encepha­
lopathy.

Palsy.

In 19 plants........................................................
In 3 ore-hearth plants......................................

7,400
1,000

1,769
397

41
29

35
19

16
9

Per cent of whole number in the 3 orehearth plants.................................................

13.5

22.4

70.7

54.3

50. 3

Smelters which have ore hearths have over five times their proper
proportion of encephalopathy (convulsions, delirium, insanity, etc.),
and about four times their proper proportion of palsy, for as they have
but 13.5 per cent of the men employed in smelting, they should have
only that proportion of encephalopathy, palsy, and death. This
excess may be due in part to the employment of Negroes1 on the.
hearths in one plant.
The most detailed foreign report on the use of ore hearths in the
smelting of lead is that given in the Austrian commission’s report.2
What is here called the Scotch hearth and by the Austrians, the
American hearth, is described in the chapter on the smelter at Gailitz.
As far as one can tell, the work is done in the same way as it is in this
country and the risks are the same, but the Austrians take the matter
far more seriously than we do. Recognizing that heat, exertion,
and exposure to fumes are inevitable at the ore hearths, they take
the one obvious precaution and reduce the hours of work. At the
time the report of the royal commission was written the following
system was in force in the Gailitz plant and was made compulsory
by the rules established in 1910. On each 12-hour shift four men are
i See p. 63.
3 K. k. Arbeitsstatistisches A m t im Handelsministerium:
gewerblichen Betrieben, I Tell, pp. 21-27. W ien, 1905.




Bleivergiftungen m hiittenmanschen tind

LEAD POISONING IN SMELTING AND REFINING LEAD.

27

employed, working in pairs for two hours at a time, then changing
off with the other pair of men for two hours, and so on, making six
hours work for each man during the 12-hour shift. The shifts are
also so arranged that a 24-hour rest period divides one workingperiod from the next. For this, three relays of men are needed,
working as follows: Shift A, from 6 a. m. to 6 p. m., Monday; B,
from 6 p. m. Monday to 6 a. m., Tuesday; C, from 6 a. m. to 6 p. m.,
Tuesday; and A, again, at 6 p. m., Tuesday. In this way the men
of shift A work for six hours on Monday and then rest until Tuesday
evening. Such excessive care is considered by the Austrians only
reasonable in view of the enormous risks involved in the work.
That the precautions are justified can be seen in the records of Gailitz,
where in 1889 there were 14 cases of colic among 61 men, but in the
two years, 1902 and 1903, not one case among 49 men.
The danger in ore-hearth work is first from the fumes in the air;
second,the danger from dust. Compared to these the danger from un­
washed hands is negligible and the best appointed and best managed
bath house and dining room will have little effect on the incidence of
lead poisoning in this department. It is a question of dust and
fume control.
SMELTING IN REVERBERATORY FURNACES.

These naturally followed the ore hearth in the evolution of this
branch of metallurgy. In the United States the reverberatory has
had its day. Ore treatment by this appliance required too much
manual labor and fuel; no mechanical device has been invented to
replace the manual labor, because of the peculiar and varied condi­
tions which must be met with during the heat on each charge.
Ore is dropped into the furnace through a hopper over the top of
the roof; the furnaceman spreads the charge about, rabbles it at
intervals, regulates his fire, and finally gets the fused residue out.
The reduced lead has meanwhile run out into its pot, and just before
the shift ends the lead is molded into 100-pound bars.
Working the charge is arduous and requires a training not at all
fostered in this country. There is but 1 of the 20 plants in which
such a furnace is in use.
REVERBERATORY FURNACES FOR ROASTING.

Ore hearths and reverberatories for smelting have been mentioned
first because they are the oldest methods and require no preparation
of the material before it is put in the furnace. But for blast fur­
naces most material does require preparation, and this brings us
to the furnaces used for the purpose of roasting and “ sintering”
(agglomerating) the ore, preparatory to smelting it in blast furnaces.
The long, hand-rabbled reverberatory has seen many decades of
service in roasting and agglomerating lead ores and mattes. The



28

BULLETIN OF THE BUREAU OF LABOR STATISTICS,

furnace is mere ly a long, narrow, closely covered floor, with a firebox
at one end, on which the fine ore is spread, stirred, pushed along
toward the hot end, and finally poked through to the buggy below.
The whole contrivance is made of brick; 60 feet is a common length,
14 feet is an ordinary width, and the arched roof is not much more
than 2 feet above the floor at the height of the arch.
The ore or matte is dropped into the furnace from a hopper over
a hole in the top of the arch near the far end of the furnace. At this
back end, where the charge is first spread, the furnace is not very
Lot and the easily fusible charge does not melt as it would at the hot
end. Gradually the charge is worked forward toward the hot end
of the furnace, but it is continuously losing sulphur, or roasting, until
finally it can be heated pretty hot and suffer strong desulphurization
before final discharge.
Spreading, stirring, and moving the charge is heavy and hot and
exacting labor. But the work does not drive the men as hearth work
does, since there is no way to check up piecework as when the lead
is weighed up at the hearth and each man is paid according to the
amount he has extracted.
There is likely to be some dust about the battery of reverberatories,
and a bad fume usually comes from the freshly drawn charge of
roasted material. After this has cooled it is shoveled and placed in
trucks, in which process dust is raised. Only two plants were found
in which this method of roasting still persists, and it is said that these
are soon to abandon it.
MECHANICAL PREROASTERS.

Owing to the easily fusible nature of all leady material which has
to be roasted, mechanical roasters were slow in making headway.
They have made great progress in the metallurgy of copper, but
with lead, only the Godfrey and the Holthoff furnaces have found
much use; until very recently the Wedge furnace, a modification of
the furnaces used in copper smelting, has been introduced. These
types of furnaces require scarcely any attention; in fact, during the
natural running of the furnace it has only to be oiled, the fire kept
up, the hopper above filled, and the roast taken away whenever a
car is filled. The furnaces make scarcely any outside dust or fumes.
Cleaning and repairing will be mentioned in connection with the
same work on all types of furnaces.
In most of the plants visited the mechanical roasting department
was clean and free from perceptible fumes except when some acci­
dent to the working of a furnace caused it to smoke for a time.
The charging is usually mechanical, and the discharge of roasted mate­
rial often takes place under a spray of water which eliminates all
risk of dust. When the work is carelessly done and dust and fumes



B u lle tin No. 141— Labor.

P L A T E 4.— H U N T IN G T O N -H E B E R L E IN PO T.
T he pot is the lo w e r half, th e upper h a lf consistin g o f th e g rea t hood and flu e w hich is
fitte d o ver th e pot d u rin g roasting. The w indow s in th e side are opened fo r ra kin g
fro m tim e to tim e . W hen roasting is com plete th e hood is lifte d o ff, th e pot caug h t by
a crane, tipped over, and th e sm o kin g charge dumped and crushed.




LEAD POISONING IN SMELTING AND REFINING LEAD.

29

-

are permitted there is danger, because both fumes and dust from
preroasters contain oxide of lead.
HUNTINGTON-HEBERLEIN POTS.

This method of roasting and sintering ores was developed in
Europe and introduced into this country in 1905. The general
design of these furnaces is shown in the accompanying illustration
(plate 4). The charge to be roasted is placed in a huge cast-iron pot
which has a false bottom. If the first layers of the charge are red-hot,
the roasting begins the moment the blast is turned on beneath the
grate; otherwise a coal or coke fire must be started in the bottom
before the charge is dumped in.
As the blast is forced into the pot and the gaseous products of
the roasting must pass away from the top of the pot, it is necessary
to provide a hood and an abundant draft in order to work about
the pot at all. The charge in the pot usually has to be poked at
intervals, thus necessitating opening the doors of the hood to see in
and use the poker.
The charging of the pots need not be bad work, for the charge
should be moist to roast best, and this keeps down the dust. Of
course, when the pots are charged with dry, fine material it is a dusty
task, and still worse when the charge is red-hot.
The discharging of the pots is an extremely unsatisfactory part of
their use. The charge is hot, smoking, and dusty; it may be dumped
out by simply turning the pot or by lifting the whole pot and turning
it over in mid-air. In any case clouds of fume and dust fill the air
surrounding the workmen and the craneman who is controlling the
mechanical hoister. The breaking of the big cakes of sintered ore
(called “ the button ” ) is a part of the dumping and no really satisfac­
tory method of dumping and crushing has yet been devised. Usually
the cake drops from a height and breaks into great masses, then a
crushing stone is lifted by machinery and dropped on it repeatedly,
and finally the men break up the refractory masses by hand and
shovel the coarse mass into the crusher or into trucks for the crusher.
This is almost always one of the most dangerous places in a smelter.
The following description of this part of the work was given by a
metallurgist who has had practical experience in many departments
of smelting:
An updraft plant (H. & H. or converter roaster) operated at capacity may be a
perfectly agreeable place at times and at others it may be a veritable hell. One day
the air may be clear and the flues carrying off every noticeable puff of smoke that
rices; another day there may be a high wind with the flues laboring to get even part
of the gases through and the place a smokehouse, with the men shirking as much as
possible, and only now and then dashing in to turn a valve or hook a chain or give
the charge a jab. The craneman has the worst of it, for he can not get out of the way.
If superintendents and managers had to endure their own upblast plants, they would
have been replaced long ago.




80

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

German factory inspectors comment on the danger of breaking the
roasted ore from these pots. In a certain smelter in the Wiesbaden
district1 the number of cases of lead poisoning increased from 33
among 459 men (7 per 100) in 1910 to 65 among 587, or 11 per 100,
and the inspector attributed the increase partly to the introduction
of Huntington-Heberlein pots, necessitating the dusty work.
Huntington-Heberlein pots are found in 6 of these 20 smelting
plants and as the converter roasters in Midvale, Utah, are essentially
the same, there are 7 plants which have from 8 to 60 pots apiece.
Usually they are placed out in the open air, but in East Helena the
winters are so severe and the snowfall so heavy that a closed building
is necessary. In all these plants there is some dangerous fume in
the working of the pots and always there are quantities of dust.
Indeed, in one very clean and very carefully managed smelter, the
breaking up of the roasted cake from these pots is the dustiest and
most dangerous piece of work in the whole place. It would seem to
the ordinary observer that it was possible to do away with hand labor
in the breaking up of the roasted ore and in conveying it to the crusher,
but the problem has not yet been solved. Everywhere one sees men
working in a cloud of dust and sulphur fumes, breaking, shoveling,
and pushing the fuming, dust}x masses to get them into the crusher.
Spraying the mass of sintered ore with water is the rule in most
places, especially to wash off the “ fines,” the powder that has escaped
the caking process, but the water does not really soak in far, and the
inside of the cake is still dry. In one of the Colorado smelters no
sprinkling was used in winter because the men are said to object to
the steam which it generates.
Although dust is the great danger in this work, fumes are not
absent. All pots leak when the wind is in the wrong direction. This
smoke is stated to contain only 10 per cent of lead, the rest being S03,
but 10 per cent of lead in a state of fine division is an appreciable
quantity. Muller regards these fumes as decidedly dangerous. He
also finds more lead on the men’s hands here than in most work. Of
two men employed in breaking up roasted ore, which had been well
sprinkled, one had 0.605 g. of lead (estimated as sulphate) on his
hands at the end of the day’s work, the other had 0.643 g. However,
Muller had had no case of lead poisoning in this department in his
plant for 13 years because of a thorough use of sprinkling and a strict
attention to the men’s cleanliness.
Laureck2 gives statistics for lead poisoning among the chargers of
the Huntington-Heberlein pots and the breakers of roasted ore in the
royal Friedrichshutte in Tarnowitz.
1 Jahresbericht d. Gewerbeaufeichtsbeamten u. Bergbehorden, 1912, vol. i, p. 490.
2 Kraukheiten der Arbeiter in Blei-, Silber-, Zink and Q.uecksilbertuitten, b y P. Laureck.
H andbuch der Arbeiterkrankheiten, p. 39.




In WeyFs

LEAD POISONING IN SMELTING AND REFINING LEAD.

31

CASES O F L E A D PO IS O N IN G AM ON G C H A R G E R S O F H U N T IN G T O N -H E B E R L E IN P O TS
AN D B R E A K E R S O F R O A S T E D O R E IN T H E R O Y A L F R IE D R IC H S H U T T E IN T A R N O W IT Z , A N D R A T E P E R 100 E M P L O Y E E S , B Y Y E A R S , 1902 TO 1904.

Cases of lead poisoning.
Year.

E m ployees.
Number.

1902
1903
1904

250
267
232

58
59
24

Rate per 100
employees.
23.2
22.1
10.3

This shows that the work even after the installation of improve­
ments was still dangerous, and short periods of work are recommended
for the breakers, alternating with the chargers.
CONTINUOUS SINTERING MACHINES.

A great deal of experimenting has been done to improve the
up-draft method of roasting and sintering and eventually a system
has been devised which depends on suction down through the charge.
The inventions of Dwight and Lloyd consist in making the operation
continuous. This is known as sinter-roasting by Dwight-Lloyd
machines, a method which is being generally adopted for roasting
and sintering work.
In this operation the well-mixed and moistened charge is fed to a
moving grate through the bottom of a hopper; the grate moves
slowly forward bearing its 4 or 5 inch layer of mixture over the edge
of a suction box and under a flame playing down from above. The
flame is drawn by the suction down toward the charge, ignites it, and
the gases pass downward into the suction box. During the passage
of the ignited charge over the suction box the' chemical and physical
work is accomplished so that at the end of the machine the cake,
which breaks off and falls into the car, is both roasted and sintered.
The empty grate passes down along an endless belt and up again to
the starting place. Meanwhile the gases and fume go from the
suction box through the flue to the fan and then away to the big
flues and bag house.
Not only has this process cheapened and improved the work in
every metallurgical sense, but the conditions of operating can be
made far superior from the hygienic standpoint to those of any other
similar process. This comes from the fact that a positive suction at
all points of the active operation may be made to draw all gas, fume,
or smoke into the machine and not permit it to escape and poison
the workmen. At the end of the machine where the smoking cake
breaks off arrangements can also be made to suck in any fume still
persisting. The influence of external conditions on the evolution of



32

"

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

fume has been guarded against and the suction works no matter how
the wind blows.
However, it is unfortunately very rare to find a Dwight-Lloyd
installation in which there is no escape of fume, and it is impossible
to find one without dust. There may be dust at the feeding point,
there is almost always dust on the floor and fine dust on projecting
surfaces. The down-draft at the roasting box is often insufficient
and little white puffs of fume escape. In recognition of this fact
the manager of the Midvale plant has placed a hood with a fan and
up-draft at this point, and also at the place where the charge falls
on the grate and where there is often quite a little dust.
A bad feature of the Dwight-Lloyd machines is the grate cleaning.
The charge sticks more or less closely to the grate and after the
roasted mass has fallen off the bits which still adhere must be chipped
off or the next charge will not stick. The dustiness of this work
varies greatly just as the stickiness of the charge varies greatly.
Usually the grate cleaner stands under the machine and works at the
traveling belt of grates as it comes down to pass up again. He uses
an air hammer to chip off the roasted ore. The accompanying
illustration (plate 5) shows a man engaged in this work under condi­
tions more favorable than sometimes obtain. Often he stands below
and works at the grates as they come down over his head. In one of
these buildings the cleaning is done by means of a long-handled rod
which lets the man stand farther off, but the best arrangement is a
mechanical cleaner attached to the grate. This was being tested in
the East Helena plant and seemed to work admirably. Grate
cleaning may be entirely done away with if the charge can be so
made up as to fall off clean from the grate. In the Murray smelter
they had succeeded in doing this and, at the time the plant was
visited, they were not cleaning their grates at all. In other plants
they sometimes try to prevent the charge sticking by first covering
the grate with lime, and though this means very dusty grate cleaning
the dust is of course not poisonous. However, when lime is added
to the charge, the resulting cake is very brittle and that makes condi­
tions at the discharge bad.
The next danger point is at the discharge.. If the cake comes off
clear and falls far down outside the building into a car where a spray
of water plays on it, nobody is endangered. This arrangement is seen
in several plants. But in others a man must be stationed at the
grate to push the cake off and even at the car below to receive the
cakes. The enormous evolution of sulphur fumes makes the discharge
a very trying place to work, to say nothing of the really dangerous
dust, and unfortunately the sulphur fumes and the dust are some­
times allowed to enter the buildings, too.



B u lle tin No. 141— Labor..

WYriVfrfW/MvM

| 7'.
'

P L A T E 5.— B E L T O F E M P T Y G R A T E S O F A D W IG H T -L L O Y D M A C H IN E .
T h e roasted cakes have dropped o ff and th e man is chipping o ff th e fra g m e n ts w hich
s till s tick to th e grates. T h is is a very much b e tte r in sta lla tio n than m any, and th e man
is not so much exposed to th e d u st as he w ould be w ere he sta n d in g below .




LEAD POISONING IN SMELTING AND REFINING LEAD.

The following descriptions give the worst and the best DwightLloyd departments that were seen:
No. 17. The Dwight-Lloyd building is unusually free from sulphur
fumes, but the floor is dry and dusty. The charge is damp and falls
without any dust from a belt conveyor into a hopper. There is no
apparent escape of fumes at the fire box. The cakes drop off more
completely than in any other place and leave the grid so clean that
no chipping is required unless the charge has been badly mixed. The
discharge takes place outside of the building, the cake falling the dis­
tance of two stories to a freight car below, where a spray of water is
playing. Nobody is required either at the discharge or below except
to inspect from time to time.
No. 19. This is much the worst Dwight-Lloyd building in the
country. The lowest floor is covered with flue dust because the flues
running through here are emptied from hoppers. Heaps of it lie
about waiting to be mixed into charges for the machines. The sec­
ond floor where the empty grates pass down is extremely dusty. The
grate cleaner stands under the belt of grates, cleaning them with an
air hammer. As there are many machines in a row, the air is full of
dust from this cleaning. On the upper floor, where the roasting goes
on, the dust is thick, but there is very little S02. There is a hood
over the flame, but it is only a fire box with no exhaust, and it is easy
to see the fumes escaping under the edge. Out on a balcony near
the discharge lie heaps of poorly sintered ore; two men stand on the
balcony breaking apart cakes which have stuck together, and 011 a
platform below stand two more men to detach the cakes and make
them drop into a car below. No water is used here, and there was so
much dust in the air that after half a minute out on the balcony the
paper of a notebook was covered with dust. On the top floor the
conditions are rather better, for there is no dust where the charge
comes down on the grates. The floor, however, was very dusty.
A man was eating his lunch up here and the lunch pails of the other
men were standing all about. There is no water for washing in this
building.
BLAST FURNACES.

The blast furnace is a tall, narrow shaft filled with charge; at the
base air is blown in and the fire rages, the charge reacts and melts, and
settles in a bath of several layers, while the gases, dust, and fume pass
up through the charge and out of the stack. From the crucible below
the shaft the melted mass is tapped out according to whether the
lower layer of lead or the upper layer of slag is to be removed. Slag
comes out at the top of the crucible level and any matte comes with
it, while the lead is drawn off from the very bottom through a well
which is sunk down to the bottom through the side of the crucible.
31080°— Bull. 141— 14------ 3




34

BULLETIN OF THE BUREAU OF LABOR STATISTICS,

Blast furnaces may be small, round affairs smelting 30 tons a day,
or any size up to the big rectangular furnaces which smelt 250 tons a
day. The little furnaces may be kept in blast a few days or weeks and
then allowed to cool down, but with the big furnaces it is a serious
thing to put one entirety out of blast, and good economy demands
that a furnace shall run for months or even years without fully draw­
ing the fire.
A “ slag-eye” is a small blast furnace built to volatilize lead. The
temperature must be much higher, especially on the surface, than in
an ordinary blast furnace, and, of course, there will be more fumes.
As the air rushes in at the feed door, there is no escape of fumes here,
but the slag, mixed with the lead which has escaped volatilization,
flows out continuously into a settling basin, which fumes all the time.
The lead sinks to the bottom and the slag overflows into a pot of
water.
There are two points of special danger about a blast furnace:
The charge floor, from which the charge or mass of prepared ore is
emptied into the furnace, and the tapping floor, where, at different
levels, the melted slag, matte, and lead are drawn off. At both of
these danger points the risk from dust and fumes may be much les­
sened if the management is really in earnest about reducing this risk,
but at both many dangerous conditions were found.
There are several methods of feeding or charging the furnaces.
For little furnaces the charge is best shoveled in at the top of the
shaft on what is known as the charge floor. The shaft usually has
one or more openings with covers which can be taken away to let
the men dump or shovel in the components of the charge and the
coke for fuel. Large furnaces commonly have their flues leading
away just below the level of the charge or feed floor, at one side or end
of the furnace, and this leaves the charge floor quite free for the
coming and going of big cars which bring the charge and dump it
into the open shaft as the bottom of the car swings open. A feed
floor of this kind is shown in illustration No. 6. Artificial drafts are
supposed to hold the stream of furnace gas in the flue and to draw in
a large amount of fresh air as well. In this way when all is working
well the fume is led away to the bag house and collected to smelt
again. Feed floors are bad when charges are dry, when fumes
escape from the charge doors, and when fumes from the slag pot and
matte kettle on the tapping floor below can come up through the
floor or the windows and poison the air.
The following are some actual conditions seen on the feed floors in
various plants:
No. 2. Refinery, specializing in scrap and dross.—There are two
blast furnaces, charged from the second story of an old building,
crowded and dark, with an old wooden floor. The place is very



B u lle tin No. 141— Labor.

P L A T E 6 — FE E D F L O O R .
An e x c e lle n t exam ple o f a feed flo o r, such as is found in fiv e sm e lters, although o n ly th re e are as good as th is . The openings to the
fu rn a ce s m ay be seen in the runw ay fo r the cars. T he m echanician co ntro ls fro m a d istan ce th e d isch a rg in g o f th e cars.




LEAD POISONING IN SMELTING AND REFINING LEAD.

35

dusty. Piles of crushed matte and heaps of dross and refuse lie
about the charge floor, aH dry and powdery. The feed door is large,
4J by 3 feet, and is up about at the level of a man’s shoulder, so that
the charge must be lifted and shoveled in with the charge feeder’s
face right in front of the opening.
No. S. Refinery for western bullion.—The blast furnace feed floor
is fairly clean, the feeding doors are in the shaft at the level of the
floor and when the door is open the inward draft is apparently good,
yet there was bad leaking either from these doors or from cracks in
the shaft, for the air w^as irritating and full of the odor of garlic,
denoting the presence of arsenic or antimony. The charge feeders
were shoveling briskly and stirring up quantities of dust, although
the superintendent said there was no reason why the charges should
not be thoroughly dampened.
No. . Refinery for western bullion.—There is only one blast furnace
for working up scrap lead, dross, and flue dust. The room is full of
very fine bluish lead dust because a dust chamber opens directly
into it. Piles of all kinds of lead refuse lie about. The furnace is
charged through doors in the stack from a platform, 12 feet above the
floor, and the charge is dusty or damp as it happens. The storage
bins are out in the open, and if there has been rain the charge is damp,
if the weather has been dry it is dusty. The furnace was being cleaned
at the time, a frightfully dusty piece of work, so it was impossible to
tell how the draft would work.
No. 13. Large western smelter.—The feed floor is decidedly bad,
almost all the furnace doors leaking, one quite shockingly. The
charges were dry and the feeders raised a good deal of dust, but it
was said to be impossible to sprinkle in that weather, the thermometer
being 5° below zero.
No. 15. Large western smelter.—The charge floor was bad, smelling
strongly of garlic, yet the manager insists that there is no arsenic
and only a small amount of antimony in the ore. There was an
enormous escape of fume from the loosely hanging sheets which close
the feed doors in the stack. The inward suction is good when the
door is open, but the doors are so arranged that there is one on each
side of a stack, and while charging is going on at one, clouds of fume
pour out through the other. Thus one of two doors is leaking
all the time. The charges were damp and the floor was clean.
No. 19. Large western smelter.—This was in a worse condition
than any other feed floor visited, frightfully smoky and smelling
strongly of garlic. The feed doors in the floor are large, about
4 by 10 feet, and only partially closed by ragged, broken pieces of
iron which are not nearly long enough to cover the ends. Every
furnace was leaking and one wras simply belching forth fumes. Cars
with charges run along a track over the furnaces. The feeders

4




36

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

stand beside the car, open the hopper gate and let the charge fall
through, a good deal of it falling on either side of the door and having
to be shoveled in after the car has passed on. This is a necessary
feature of furnace feeding in some plants, in order to spread the
charge property. The condition on the floor was made unusually
bad at the time of this inspection because one of the furnaces was
being “ trimmed off.7’ The blast had been turned off this furnace,
but it was still hot and fumes and dust were abundant. Sixteen
men were working on the charge floor at the time.
Conditions on the feed floor are so dependent on the proper work­
ing of the furnaces that it is impossible to pronounce absolutely on
any single plant unless it is visited repeatedly. The very best blast
furnace is subject to accidents; none of them work well all the time.
The following are plants in which the feed floor is very well constructed
and at the time of the inspection everything was working normally.
No. 10. Large Mississippi Valley smelter.—The charges, well
dampened, are conveyed in hopper cars to a large, open, clean feed
floor, with charge doors in the floor. The whole process is automatic,
the car stops over a charge door, the mechanician who stands at a
distance opens the hopper door and the charge drops down. The
down suction was excellent at the time and there was no escape of
smoke, though the charge doors were all left open. The floor was
scrupulously clean and well dampened.
No. 17. Large western smelter.—Here there is a similar arrange­
ment of floor, only the charge doors are closed when not in use.
The floor was clean and wet and there was no escape of fume during
charging, which is automatic, but a strong wind was driving the
smoke up from the tapping floor below.
No. 18. Large western smelter.— The feed floor here is like the two
former, the doors being left open all the time. The down draft was
good and there was no escape of fume from most of the furnaces,
but two were smoking badly. The dumping of the charge is not
automatic, but must be managed at the feed door and the man there
must also shovel in the part of the charge which falls at the sides of
the door. There were traces of garlic in the air. The floor was
well watered in spots, yet at one end a man was sweeping it dry.
With good management the feed floor can be kept clean and free
from objectionable fume and dust except during the “ blowing out??
of a furnace. This is an accident which may come so rarely as
to be fairly negligible or so frequently as to be almost a part of
the day’s work. When the charge for some reason sticks to the
side, forming what the workmen call “ hangs” or “ scaffolds,” the
blast of air from the tuyeres forces a channel through and rushes up
the stack, filling the feed floor with fume. This channel may be
plugged up with siliceous material after the blast has been turned off,



B u lle tin No. 141— Labor.

P L A T E 7.— B LA S T FU R N A C E D U R IN G S LA G T A P P IN G .


T h is is a b e tte r hood than the average and a t tim es catches th e fu m e s v e ry w ell, b u t not when th e w in d is
http://fraser.stlouisfed.org/
was w hen th is photograph was ta ke n . A good fe a tu re here is th e long rod w hich th e man uses, e n a b lin g
Federal Reserve Bank of St. Louissm o ky area. H ow ever, to close the tap he m ust approach nearer.

in th e w ro n g d ire c tio n , as it
him to stand o utside of the

LEAD POISONING IN SMELTING AND REFINING LEAD.

37

or it may be necessary to stop work and dig out the ‘ ‘hangv’ Even
when water is used digging is dusty, and often it is done while the
furnace is hot to save time. This description of the work was given
by a man familiar with furnace cleaning or “ wrecking:”
All blast furnaces require more or less cleaning out after a run which has clogged
the inside of crucible and shaft. This is one of the most disagreeable tasks in con­
nection with furnace operations. It is often done with the blast merely turned off
(cleaning breast and well) or with the furnace run down part way (cleaning “ hang'’
in shaft) or with the end jackets out (cleaning shaft), and is inevitably a hot and dusty
and arduous job. Hours spent in cleaning shafts are not easily forgotten. With
bar and pick we pry and strike at the softer spots; then we get the big ram lined up
and swing its 500-pound weight against the gad that pierces and cracks the crust
inch by inch; the furnace walls are too hot to touch, the scanty platform sways and
bends, clouds of dust and steam surge and blind and choke us with every lump that
falls; every half hour the four men hustle out and four reliefs climb down and rush
the job. Furnaces are usually pretty tractable, but blowholes and blowing outs,
burn outs, and closed channels make them interesting enough every now and then.
TAPPING FLOORS.

On the tapping floor of a blast furnace, or at the front, are the
furnace men, the tappers who draw out the lead, matte, and slag at
intervals, the unskilled laborers who wheel the lead away, and in
larger smelters the trainmen who take away by motor the kettles
of matte and slag. The danger on the tapping floor is not from dust,
but from fume. The lead runs out at a low red or a bright red heat,
fuming always more or less, although the fumes are not nearly so
conspicuous as those from slag and matte, and are therefore usually
ignored by the men in charge. The lead pot is not hooded, though
in some plants the molten lead is covered with slaked lime. The
objection to a hood seems to be that it would get in the man’s way
when he skims off dross or poles out the channel to free it from dross.
Slag and matte as they run out into the settler or forehearth
fume thickly. The accompanying illustration (plate 7) shows the
extent to which the men are exposed to fumes during slag tapping,
even when conditions are fairly good. Slag alone usually contains
not more than 1 per cent of lead, but may contain 2 or 3 per cent,
depending on the way the furnaces run; matte from 13 to 20 per cent.
As matte fumes far more than lead, matte tapping is the most
dangerous feature of this part of the work. It occurs about every
40 minutes and always dense clouds of white fume arise, lasting for
several minutes. It is very rare to find the hood over the matte
kettle at all effective in carrying off these fumes, and often there is no
attempt to hood it at all. Even where there is a hood the train crew
generally pulls the kettle out before it has stopped fuming and
carries it off, spreading the smoke as it goes. Slag is tapped every
10 minutes or so. The fumes from this also are very abundant, but
usually the slag kettle is better hooded than the matte. In the



38

BULLETIN OF THE BUREAU OF LABOR STATISTICS,

case of those furnaces wliich are not provided with a settler the
mixture of slag and matte must be taken at once before it has had
time to cool and poured into the settling furnace. This means
an enormous escape of fumes. The three illustrations immediately
following (plates 8, 9, and 10) show the conditions under which
tapping is carried on in some of the plants visited.
A few instances will serve to illustrate the way in which the work
is carried on in different plants.
No. 5. Large refinery for western bullion.—The blast furnace is in an
inclosed room with a low ceiling and little natural ventilation. Lead
and arsenical antimonial slag are tapped here. There is no hood
over the lead tap and over the slag tap there is a shaft running up
to the roof, but without any exhaust, so it is very ineffective. The
air was full of the odor of garlic.
No. 13. Large western smelter.—As one approaches the tapping floor
great clouds of fume can be seen coming out from under the long roof.
The floor is open on three sides and covered with a roof which has a
wide stack over each tapping floor. These stacks are supposed to
carry off the fumes and may do so fairly well in still weather, but on
a windy day the fumes blow in all directions. A little additional
protection is afforded by a shield of corrugated iron hung at one side
of the runway and pot for slag and matte, but the whole construction
is far too open to admit of any control of drafts and currents. The
odor of garlic was strong, and the ore handled here is often rich in
arsenic. There is no forehearth on these furnaces, so slag and matte
run out into an open kettle and are wheeled off to the settling furnace
while still hot and fuming.
Better conditions than this are found in some blast furnaces, but
the tapping floor is not a safe place in any of the plants that were
visited, and this is due partly to a very open construction which fails to
shut out varying winds, and partly to the lack of properly fitted hoods
with a system of exhaust ventilation. It is strange that even the
most modern smelters have been built with dependence on natural
ventilation to carry off fumes, although any ventilation expert will
say that such an arrangement is at the mercy of wind and weather.
No. 16. A large western smelter.—This has a fairly good arrange­
ment of hoods, one large hood covering trough, settler, slag car, and
matte kettle. When tapping and when closing the tap, the man
must go close to the furnace, but once the stream is started, he steps
out beyond the edge of the hood. The fumes from both slag and
matte passed up through the stack very completely, but it happened
to be a still day, and the men say that on a windy day the state of
things is quite different.
Other large smelters have equally good tapping floors, but all are
open and are dependent for their successful working on the wind.



B u lle tin No. 141— Labor.

P L A T E 8.—T A P P IN G

F LO O R O F A B L A S T F U R N A C E IN T H E A M E R IC A N
& R E F IN IN G C O .’ S P L A N T A T M U R R A Y , U T A H .

S M E L T IN G

The a rran g e m en t in th e M id v a le p la n t is e xactly th e same. Slag is pouring o u t into th e fo re h ea rth
and o v e rflo w in g into th e slag pot in fro n t. The day being quiet, no fu m e s are escaping. T h is is,
however, not th e case a t all tim e s. W hen th e w in d blow s in to w ard th e fu rn a c e th e ta p p in g flo o r
seen in th e le ft co rn e r may be th ic k w ith fu m e s. The side of th e b u ild in g fa c in g these fu rn a ces
is all open.




B u lle tin No. 141— Labor.

P L A T E 9.— M A T T E T A P P IN G IN T H E A M E R IC A N S M E L T IN G
PLANT AT M URRAY, U TAH .

& R E F IN IN G

C O .’ S

T h is is on th e o th e r side of th e same fu rn a ce . I t is easy to sfee th a t though th e hooding protection
is adequate a t tim e s a p u ff of w in d could easily sca tte r th e fu m e s fro m th is m atte k e ttle . These
hoods are, how ever, b e tte r th a n those in any o f th e o th e r sm e lters th a t w ere v isited except those
a t M id v a le .




B u lle tin No. 141— Labor.

P L A T E 10.—T A P P IN G

A N T I M O N IA L S LA G F R O M

A FU R N A C E .

T he slag o ve rflo w s into th e second k e ttle ; th e lead settles in th e f ir s t k e ttle w ith a sm a ll c ru s t of m atte on top.
th e top o f the p icture , too high up to be o f any real use.




T he hood can be seen at

LEAD POISONING IN SMELTING AND REFINING LEAD.

39

The consequence is that in all smelters the tapping floor is looked
upon as one of the most dangerous spots, if not the most so. One plant
in which careful records have been kept has more trouble here than
anywhere, as is shown by the fact that 23 out of 54 blast-furnace men
who were examined showed evidence of plumbism. In still another,
21 out of 65 cases of lead poisoning in the plant came from the front
of the blast furnace, though the men here formed only one-sixth of
the whole force. Kefineries do not have so large a blast-furnace
installation as smelters, but some of the worst conditions encountered
on charge floors and tapping floors were in refineries. Five out of the
seven worst instances are in refineries.
Two of the plants visited make sublimed white lead, basic sul­
phate of lead, in addition to their other products. The method
employed is essentially smelting in Scotch hearths, collecting the
“ blue fume’’ from these hearths, and smelting it in blast furnaces
of the type known as the “ slag eye.” 1 These are kept at a high
temperature, especially on the surface, for the object is to cause as
much volatilization as possible. The “ white fume” from the slag
eyes is collected in a bag house and consists of lead sulphate with a
varying proportion of oxides.
As the three worst features of lead smelting, the ore hearth, the
blast furnace, and the bag house are the essential elements in this
process, it follows that the making of sublimed white lead is an
extremely hazardous occupation. In both plants bag shaking is
done by hand,, and in both the packing of the light and fluffy powder
is very dusty. The men look on the “ paint” department as the
worst place of all to work in. In one of these two plants 16 men in
the sublimed white lead department had been recently examined
and 5 were found to show signs of plumbism, while 11 had the lead
line. In the other plant it was not possible to get any informa­
tion from the physician, but 12 men were found who had recently
suffered from acute plumbism. There are 45 men regularly employed
in this department in the plant.
PREVALENCE OF LEAD FUMES AND DUST ON CHARGE AND TAPPING FLOORS.

Collis speaks of the dangers of both dust and fumes on the blast­
furnace charge floor.2 At one factory he found that three out of seven
chargers had marked tremor, and one of these had extensor paralysis,
while all seven had the lead line. In another factory partial blocking
of the flue and escape of furnace fume on the charge floor resulted in
three cases of lead poisoning. Collis quotes the analysis of the fumes
at the tapping floor of a blast furnace which was given in the annual
1 For description, see p. 34.
- Lead Smelting. Special Report on Dangerous or Injurious Processes in the Smelting of Materials
Containing Lead. B y Edgar L. Collis, M. B ., H. M. medical inspector of factories, 1910, p. 7.




40

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

report of the chief inspector of factories and workshops in Great
Britain in 1900. It was calculated that on this floor a man might
in eight hours breathe in 7.38 grains of lead (0.478 g.) 1
Hofman 2 gives the average lead content in the down comers of a
blast furnace as 47\ per cent, and of the dust on the roof of a blast­
furnace building as 27.1 per cent.
Muller places blast-furnace tapping in the class of greatest danger
if fumes are allowed to escape, but if proper devices are installed it may
be classed with the comparatively safe work. All fumes on the tap­
ping floor, whether lead, slag, or matte, must be regarded as a menace.
The managers of American smelters usually acknowledge the danger
from matte fumes, but look on the fumes from the lead tap as negli­
gible, because they are never very heavy, and in fact are visible only
close to the pot. The fumes from the slag pot they consider practi­
cally safe, because there is supposed to be less than 1 per cent of lead in
the slag. Both these opinions Muller regards as very erroneous. The
fumes from the lead pot are practically pure lead oxide, and as for the
slag pot the fumes contain a much higher proportion of lead than does
the slag itself. He has found by analysis of slag fumes that there
may be 12.3 per cent of lead, 8.7 per cent of zinc, and 4.2 per cent S03.
Hofman3finds far greater quantities of lead than this in the fumes
from a boiling slag pot which may contain no less than 41 per cent
lead monoxide, 26.2 per centPbS04, and 4.8 per cent arsenious oxide.
Muller has also analyzed samples of dust which collected between the
tap for lead and the tap for slag and found it to be 17.4 per cent lead.
Matte comes out under high pressure, very hot, giving off thick white
fumes, consisting chiefly of PbS, which changes almost at once to
PbS04. Muller’s analysis of these fumes gave 18.8 per cent lead, 10.9
per cent zinc, 5.9 per cent S 03. Matte fumes are, of course, worse
than slag fumes, but not nearly so abundant, because matte is usu­
ally tapped every 40 minutes, while slag is tapped every 10 minutes.
Muller's comment on the hooding devices in use on tapping floors is
that they are generally useless and expensive decorations. That those
in his own plant are effective is shown by the decrease in the number
of cases of lead poisoning, which fell from 10 among 30 men in 1897
to none during the 10 years from 1898 to 1908. When a visit was
made to his plant in 1910 it was found that the tapping floor was in
a well-inclosed and very clean building, with whitewashed walls, and
that the dependence was upon artificial ventilation altogether. Over
the lead tap and the tap for slag and matte a large hood was fitted, the
edges of which came down to within 3 feet of the floor. This was
connected with the flue system and there was a strong suction in the
1 Great Britain, Annual Report of the Chief Inspector of Factories and W orkshops, 1900, p. 438.
3 IT. O . Hofman. Metallurgy of Lead, p. 379. New Y ork, 1899, 5th ed.
s Loe. cit.




LEAD POISONING IN SMELTING AND REFINING LEAD.

41

shaft. A window in this hood allowed the workman to open and close
the tap with a long-handled rod. The workman was not allowed to
wheel away lead pot, slag, or matte till the contents had cooled to at
least a dull red heat.
The statistics of lead poisoning among blast-furnace men in the
great smelter atTarnowitz show the effect of installing proper exhaust
ventilation over the taps. The improvements were begun in 1888,
but were carried out chiefly in 1890.1
CASES OF L E A D PO ISO N IN G AM ON G B L A S T -F U R N A C E MEN IN T H E S M E L T E R A T
T A R N O W IT Z , A N D R A T E P E R 100 E M P L O Y E E S , B Y Y E A R S , 1887-88 T O 1891-92.

Cases of lead poisoning.
|Number of !j
employees, j

Y ear.

Number.

1887-88 ..................
1888-89 ..................
1889-90 .................
1890-91 ..................
1891-92 ..................

164
130 1
140
138 |
124 !
i

136
63
58
19
24

Rate per 100
employees.
82.9
48.5
41.4
13.8
19.4

SETTLING FURNACES.

In place of a forehearth or settler at the mouth of a blast furnace,
certain plants have installed a settling furnace for the separation of
matte and slag. There are several disadvantages in this arrange­
ment. Instead of the matte being tapped only at intervals of threequarters of an hour, matte and slag are tapped together every 10 or
15 minutes, and the great open pot must be wheeled away red hot
and fuming to be emptied at once into the furnace. No precautions
against fumes at any stage, including the final tapping of matte from
the settling furnace, are to be found in any of the three plants where
this method is in use. In one, which is fortunately possessed of a
careful and accurate medical adviser, it was found that 6 cases of
lead poisoning developed in as many weeks among 36 motor men
and furnace tenders engaged in transporting and handling the slag
and matte.
Hofman’s analysis of fumes from a reverberatory settling furnace
for matte showed 31 per cent lead monoxide and 2.3 per cent arsenic.
SOFTENING AND REFINING FURNACES.

After smelting the lead is ready for the finishing processes, of which
softening and refining come first. Reverberatory furnaces are used
for this process. Hand charging of this type of furnace is becoming
obsolete and in a modem plant the workmen have merely to place
the bar of lead on a conveyor or run the already molten lead into the
furnace through a pipe or spout. The accompanying illustration
1 Die Bekampfung der Bleigefahr in Bleihiitten.




R ich. Muller, Jena, 1908, p. 154.

42

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

(plate 11) shows one method of mechanical charging in such a furnace.
The furnaces are emptied through tapping the lead out or by a,siphon.
During the process of softening and refining more or less fume escapes
at the time of drawing drosses and skims and sometimes at the lead
pot. The red-hot skim also fumes after it has been drawn out.
These are two instances of such furnaces:
No. 2. The softening furnaces for the removal of copper, arsenic,
and antimony are in a dirty but fairly well-ventilated room. They
are charged by hand from the front. A man standing at a distance
of 8 feet holds a long-handled spade with its end resting on the edge
of the furnace door. Two men come up in turn to the door, place a
pig of bullion on the shovel and the shoveler pushes it into the fur­
nace. There is no hood over this door, but the inward draft seems
good. Later, when charging is over, the men open the door and rake
the charge and during this process fumes escape. The lead runs out
into the zincing kettles, the hot slag is skimmed off, and throwrn on
the floor. There is no attempt to avoid either fumes or dust.
No. 5. Here charging is done mechanically from a traveling belt.
The furnace is first raised to a low heat and the copper removed, then
to a much higher temperature. The doors are then opened and the
furnace gradually cooled down. During this time white fumes
escaped from the four openings and though their general direction
was upward to the window in the roof some eddied down driven by
the drafts of air in all directions. A man stood about 8 feet from the
door and raked out the red-hot arsenical and antimonial skim which
fell into a pot and splashed on the floor. This gave off thick white
fumes as the man dragged it away and stood it at one side to cool.
The furnace doors are left open three hours and the charge skimmed
from time to time.
The same sort of furnace is used in refineries for melting old lead.
The work in one of the largest of this class of refineries (No. 7)
is done in a large, dark, ill-ventilated, and extremely dusty room,
the floor of which is covered with heaps of dross and scrap.
There are no hoods over the charge door or work door, and win­
dows in the room are relied upon to carry off the fumes. Charges
are mixed here and fed in by hand, and at least once an hour the
furnace man opens the work door and rakes the charge. He stands
about 6 feet away but well within the fumes which escape in great
clouds and eddy around the room so that they are distinctly per­
ceptible at a distance of 30 feet. The lead flows out at a bright red
heat into an unhooded kettle.
There are two refineries in which an electrolytic process is used to
obtain pure lead. The work in the battery room is dust free and
not accompanied by risk, except such as might come from handling
the lead sheets. The places where precautions are needed are at



B u lle tin No. 141— Labor.

P L A T E 11.— A S O F T E N IN G F U R N A C E IN R E F IN E R Y , W IT H
C H A R G IN G .

M E C H A N IC A L

T he pigs of b u llio n come down th e closed chute to th e charge door. In c o n tra s t to th is
e xcelle nt device is the carelessness w hich a llow s heaps o f d usty dross to lie on the
flo o r near th e fu rn a ce.




LEAD POISONING IN SMELTING AND REFINING LEAD.

43

the kettle where scrap lead is melted for the starting sheets, in cast­
ing the starting sheets, in melting up the old sheets and drossing the
melting kettles, in working up the drosses in reverberatory furnaces,
and above all in handling the so-called “ anode mud,” the product of
electrolysis. This wet slime or sludge is said to consist of lead, sil­
ver, and gold in metallic form, with arsenic, antimony, and copper
in compounds as yet undetermined. It must be treated in rever­
beratory furnaces, and in preparation for this it is dried in dust
chambers. Transporting and charging this dry powder is very dan­
gerous, and there are of course the usual dangers from the furnaces.
DROSSING, REMELTING, AND DESILVERIZING KETTLES.

Practically all lead plants have open cast-iron kettles for holding
the lead to be melted, drossed, desilverized, or purified. The tempera­
ture has ordinarily no occasion to rise above some 450° C. (842° F.),
the melting point of zinc. As this is below even a low red heat,
there is practically no volatilization of metal and no production of
fume, and therefore no source of contamination except what is to be
expected from handling lead or leady materials. Lead may be
charged into the kettles by hand, as in the case of bars and sweep­
ings, or in huge slugs lifted by power; most frequently the already
molten lead is run in through spouts or poured in from a lead pot.
Kettles are emptied by a siphon or by a pipe from the bottom pro­
vided with a turncock. It is better to run the molten lead through
a pipe rather than a trough, especially if it is at a red heat, when it
may fume.
In one large refinery there are no hoods over the charge doors or
work doors of the softening furnaces, and when the crust is skimmed
and the lead allowed to flow out fumes escape into the room. The
lead flows along a trough to the desilverizing kettle, which is at some
distance away, and therefore the lead has to be at a fuming tempera­
ture or it would partly congeal before it reached the kettle.
Desilverizing may be, and in fact almost always is, so carried on
as to be practically free from dust or fumes. The only danger is
from the lead which clings to the men’s hands and which is pure
metallic lead or the oxide.
Oliver 1 says it is rare to find lead poisoning in a desilverizer, and
Muller placed here his workmen who had had lead poisoning, con­
sidering it the safest part of the plant.
BY-PRODUCT OR RESIDUE FURNACES.

The material put in these furnaces is usually solid. It is first
dumped into a hopper over the furnace, then let into the furnace
through the roof. It is not unusual to shovel the charge in through




1 Dangerous Trades, p. 287.

44

BULLETIN OF THE BUBEALT OF LABOR STATISTICS.

side doors. The furnace is emptied by tapping out into slag pots,
skimming through side doors, or letting the lead out through a well.
As can be seen by the illustration (plate 12), these by-products or
residue furnaces may be a prolific source of fumes in the plant, for
there is seldom much effort made to carry off the fumes from slag
or lead.
The arsenic in many by-products is a real source of trouble. Men
come in contact with it in a variety of ways, at the furnaces as fume
or dust, but more especially in the handling of the stuff and in getting
it from one place to another.
Matte roasting is carried on only in large quantities; if the quan­
tity is small, the matte is shipped to another plant.
A copper converter for the recovery of copper from matte is a
steel shell lined with refractory material with holes in the bottom,
through which air is blown to oxidize and blow away sulphur and
lead, leaving the copper. The converters are charged usually with
liquid matte.
This “ blowing’’ process is of course productive of an enormous
amount of fume which contains lead as sulphate and oxide, and the
three plants which use this process have not succeeded in catching
and carrying off the dangerous fumes. In all three places the work
is very bad indeed. On going over the records of one of these refin­
eries it was noticed that the cases of lead poisoning rose suddenly
in a certain year, and the reason given for this increase was that the
copper converters were installed in that year. The following descrip­
tion will illustrate the conditions which are encountered by men
employed in this sort of work:
No. 1. The converter room is large, with a high ceiling and travel­
ing cranes. The air at the time was full of fumes, almost hiding
the motor man in the crane. There are adjustable hoods over the
doors of the converters; these are lowered when blowing begins and
turned with the converter, but they do not catch the fumes, espe­
cially at the beginning of blowing. In this same room is a furnace
for holding and settling matte for the converter. It is charged from
the top, the opening is neither closed nor hooded, and fumes escape
all the time.
RETORTING AND CUPELLING FURNACES.

In the refining of lead these furnaces are an important link in the
sequence of recovering the gold and silver. They are both quite
neat in operation, and with proper draft and ventilation should give
no offense. The rich amalgam of zinc and lead in chunks is dropped
into the retorts in the Fabre du Faur tilting furnace and the con­
densers sealed on at the neck of the retort. At the close of the
distillation, when the zinc has been volatilized, the condenser is
removed and the rich lead poured out and wheeled to the cupelling



B u lle tin No. 141— Labor.

P L A T E 12.— R E S ID U E FU R N A C E OR C O P P E R M A T T IN G F U R N A C E .
T he lead drip s fro m th e w e ll in fro n t to th e lead ke ttle .




T h e re is no hood here a t a ll.

B u lle tin No. 141— Labor.

P L A T E 13.— FA B R E DU FAUR Z IN C D IS T IL L A T IO N FU R N A C E .
T he re to rt is shown w ith th e zinc condenser in place. W hen th is is rem oved th e rich
lead o r dore runs out. T h e re is no hood to catch th e fu m e s.




B u lle tin No. 141— Labor.

P L A T E 14.— P O U R IN G T H E R IC H LE A D F R O M A R E T O R T IN T O A C U P E L L IN G
FURNACE.
T h is lead is red hot and th e re is no hood.




LEAD POISONING I N SMELTING AND BEFINING LEAD.

45

furnace, into which it is poured. From the cupels the dore, silver
and gold, is recovered, the lead is oxidized to litharge, and the arsenic
and antimony are lost in the fume.
The accompanying illustrations (plates 13 and 14) show where the
dangers may arise in retort and cupel work. When the condenser is
removed from the retorts, there usually is a copious discharge of
fume.
In one large refinery in a room with nine retorts one large hood
runs the whole length of the room over the doors of these furnaces.
The draft inside this large hood is of course insufficient to carry off
the fume, and the company is experimenting with individual hoods
over two furnaces at the end of the row. These two, however, are
connected wTith the same flue, and it is expected that the workmen
will turn on the draft over one when it is tapped and at the same
time turn off the other so as to concentrate the exhaust on one.
When this room was visited, some Slavic workmen were engaged in
tapping one retort and great clouds of white fume were pouring out
and spreading through the room. The superintendent ran forward
and threw open the draft with one motion of his hand, but the men
could not understand his reproof, administered in vigorous English,
and they evidently did not see what had been wrong or understand
its importance.
In another refinery the “ blue pot,” which is a mixture of lead and
zinc, was running out from one of the eight retorts, fuming, and the
fumes continued to escape from the kettle which held it. There are
no hoods here.
In all three of the largest cupelling plants the arrangements for
catching and carrying off the lead fumes are far from adequate, and
the litharge pot which catches the drip is allowed to fume also.
Muller believes that if precautions are not taken to prevent the
escape of fumes work at the retorts and cupels may be as bad as
that at the blast furnace. An additional danger is the dust caused
by breaking up the cakes of litharge from the cupels, work which is
always done by hand.
Collis 1 states that he examined seven men engaged in cupelling
and all had the lead line and four a slight extensor tremor.
There is a process of driving out the last remaining zinc from the
lead by means of a blast of dry superheated steam, which is consid­
ered distinctly dangerous. Lead oxide and zinc oxide are formed
and at the same time atomized, and if the blast is too strong and the
hooding insufficient they are driven out into the room in the form of a
very fine dust. Probably there is always some lead oxide in the air
around this kettle, even when steam is not pouring in, and the skim­
1Load smelting.
Containing Lead.

Special Report on Dangerous or Injurious Proc3sses in the Smelting of Materials
B y Edgar L. Collis, H . B ., II. M. medical inspector of factories, 1910, p. 13.




46

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

ming off of this mixture of oxides of lead and zinc is very productive
of dust. It should only be done with every possible precaution.
There is but one refinery in which this method is used, and it has
not yet been running long enough to show how much danger there
is in the work
LIQUATING FURNACES.

These furnaces are few in number, small, and simply worked.
The bars of lead are thrown in by hand or on a paddle, and the lead
drips away from the sump into a kettle. The residue, which is small
in amount, is scraped from the hearth by hand.
FLUE-DUST SYSTEM.

The dust and fume collection system in a modern American smelt­
ing or refining plant is very large and elaborate. Usually steel flues
pass from the roasters and blast furnaces to end in great brick flues,
and these in turn pass on to the bag house. The accompanying illus­
tration (plate 15) shows how the flues may be arranged. The steel
flues are usually furnished with some arrangement for allowing the
heavier flue dust to be removed. This can be done through windows
in the flues which permit the flue cleaner to insert a bent hoe or rake
and to scrape out the dust, or, if the flue is very large, permit him to
enter and shovel it out. Better than this is the arrangement found
in many plants where hoppers are placed at intervals along the flue,
and it is only necessary to open the sliding grate at the bottom of the
hopper and let the dust fall into a car placed below. If a canvas
chute is used from hopper to car, there need be very little dust in
emptying the hopper, especially as the dust in steel flues is usually
damp. The brick flues have doors, which are bricked up except
during cleaning time. The lighter flue dust falls here, and the lightest
passes on to the bag house.
The flue dust is a bluish black powder, light and fluffy, consisting
chiefly of the oxides and sulphate of lead in varying proportions
and also of arsenic, if the ore smelted contained arsenic. Western
ore has often a large amount of arsenic, which complicates very much
the difficulty of handling the flue dust.
Brick flues are always entered by the workmen and the dust shov­
eled out. Bag houses are handled in different ways. The dust
clings to the sides of the bags and must be shaken out. This is done
by hand in several otherwise well-managed plants, four in all, but
fortunately the majority of modern plants are furnished with some
sort of mechanical device for this dangerous piece of work. Reversing
the current of air and thus causing a vacuum which makes the bag
collapse is the best way of shaking them, and this is done in two
plants. Others have a shaking mechanism controlled from the
outside by a handle.



B u lle tin No. 141— Labor.

PLA TE 15.— FL U E A N D BAG H O U S E S Y S T E M .
T h e long b ric k flu e s , connected o ver a gateway by a steel flu e , run to th e bag house in th e le ft co rn e r o f th e p ic tu re —th e b u ild in g w ith o u t
w in d o w s. T h is is one of th e sm elters in w hich th e re is no m echanical a rra n g e m e n t fo r s h a k in g th e bags.




LEAD POISONING IN SMELTING AND REFINING LEAD,

47

A bag house should always be divided into separate compartments,
not only because of the danger from fire, but also because if the bags
are all in one room the whole house must be shut off once every day
when they are shaken, and this means that the whole draft system
is out of commission during that time. As for the emptying of the
bag-house tunnels, in which this dust is caught, there are various
methods used. The dust may be burned first in the tunnel, which
makes it cake or sinter, or it may be shoveled out without burning.
As a usual thing no sprinkling is used in this work.
It so happened that two plants were in process of bag house or
flue cleaning at the time they were visited. A third has a continuous
process of emptying. In the first (No. 9) the tunnel dust had been
burned, and the two tunnels which were opened were still smoking.
The men were at work in one of these and were shoveling out the hot
dust which had been changed by the burning into masses like coral
rock. No water was used, and the dust and fume were excessive.
The manager said that it was not necessary for the men to go into
the tunnel before it had quite cooled off, but they were working on
contract and did it to save time. The men were well protected by
a complete suit of overalls, a respirator, and an effective head cov­
ering. The cars full of flue dust were drawn away by the train­
men, the dust blowing all about. The bag house here has no mechan­
ical shaker, and the bags must be shaken by hand. There is an
excellent bathhouse here and an attractive lunch room.
No. 13 has only hand shaking, two men on each of three shifts
being employed in shaking and repairing bags. The dust in the
flues which comes from the blast furnace contains 40 per cent of
arsenic. One of the great brick flues from the Dwight-Lloyd machines
was being cleaned. It is a long, vaulted chamber piled with flue
dust about 2 feet deep in the center and 3J feet at the sides. This
is very fine and light dust. It had not been burned or sprinkled,
and the men were shoveling it out as it was. They had overalls and
caps, and handkerchiefs tied over their mouths, but they were not
really protected against the dust. A small wash room and lunch
room is provided for the flue-dust men.
By far the best arrangement is seen in the United States smelter
at Midvale. There is a very large bag house here with some unusual
features. In the first place, the S03 in the fumes is neutralized by
mixture with volatilized zinc oxide, forming zinc sulphate. The
process is patented by this company. Another scheme for neutral­
izing the S03 is by introducing lime into the flues. This also is pat­
ented. The construction of the tunnels is different from that in any
other plant Instead of having simple openings in the roof of the
tunnel through which the dust from the bags falls, each opening is
connected with a hopper which catches the dust and discharges it



48

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

into a screw conveyer. The tunnels are all open, and carts could
be seen standing at the discharge of the screw conveyers near the
doors. The men are not obliged to go into the tunnel at all. Bags
are shaken by reversing the current and causing a vacuum in one of
the twelve compartments of the bag house at a time. Bag repairing
must be done at least once a day, but never until the compartment
has been shut off and the windows opened. The big flues are cleaned
once in six months by flushing out. The workman opens a hole in
the top of the flue and a vent at the bottom leading to a large pipe;
then he directs the water from a hose into the flue, and the dust is
washed out into a settling tank. The flue dust here contains a high
percentage of arsenic, and the company has done much for the pro­
tection of the men against arsenical and lead poisoning by providing
overalls, helmets, and gloves, a bathhouse with hot water, soap, and
towels, separate lockers for street clothes and working clothes, and
a well-heated lunch room.
There is the widest diversity of opinion among the managers of
these plants as to the advisability of burning the flue dust and as to
the feasibility of sprinkling it. All of them acknowledge that the
work is very dangerous, and in those plants where the ore is rich in
arsenic the men are quite efficiently protected against the dust.
Fortunately the precautions taken against arsenic are equally effective
against lead. Clean wash rooms, hot water, soap, and towTels are
always provided in these plants and some even furnish working
clothes, masks, and gloves. In every plant where there is any pro­
vision at all for cleanliness it is evident that the needs of the flue men
and the bag-house men have been first attended to and rightly so, for
no other workers get as much lead dust on their bodies as the flue
and bag-house men.
In smelting and refining plants the flue and bag-house work is
regarded more or less as an emergency except for the men regularly em­
ployed at it, from about two to twelve in number,. When the steel
flues must be cleaned, once in two or four weeks, or the brick flues,
once in three to six months, or the bag-house tunnels, once in four to
twelve months, a special gang of men is collected for the work,
usually from the yard gang, with perhaps some men from the bri­
quetting house, unless a contractor from the outside brings in his
own men. The work of cleaning must be rushed through as rapidly
as possible, especially on the bigger flues and the bag house, because
to shut off any considerable part of the flue system interferes with the
working of the furnaces. Thirty or 40 men are often put on at
once and when the work is not let out on contract the men are not
required to work for long hours. Sometimes they work only five hours
a day.



LEAD POISONING IN SMELTING AND REFINING LEAD.

49

As to the sprinkling of the flue dust, one manager says that it is
possible to sprinkle the bag-house dust, but not that in the flues,
because the latter is hot and the steam would be excessive. Usually
the opinion is that if the sulphate in flue dust is all combined, as it is
in the dust from copper converters and from white lead, it can be
dampened down without harm, but dust from reverberatory furnaces
has free S 03 which with the water would form sulphuric acid and eat
into men’s clothing and cause painful burns on their skin. The success
of the Midvale system comes from the neutralization of the S03prac­
ticed there. However, even in bag houses and flues which receive
only lead sulphate dust, without free S03, the dust is sometimes
handled dry, because sprinkling is said to stir up so much dust. Of
course if the trouble from sulphuric acid could be eliminated there
is no comparison between the danger of working with wet paste and
with fluffy dust. As to the objection to sprinkling that it raises so
much dust, this is true, as can be seen in any dusty street when the
stream from a hose is turned on it with too much force, but no one
would advocate cleaning the street by dry sweeping instead. The
dust can be laid without much difficulty by a slower sprinkling. In
those plants where the flue dust is made into briquettes there is a
real advantage in having the stuff already damp and pasty.
Muller objects on practical grounds to wetting the dust in the flues,
because if the water is squirted in it stirs up dust, and sprinkling
takes too long. He also says that the sulphuric acid formed would
be enough to destroy the bricks which line the flue. He advises
burning the dust to cause sintering and then carefully protecting the
workmen, giving them a short working period and choosing only
strong men for the work.
Oliver 1says that the British White Lead Commission visited certain
smelters and as a result of what they saw advised that flue cleaners
should never work longer than two hours at a stretch.
HEAT AND EXERTION.

The exhausting effects of hard, physical work and of exposure to
great heat are not so great in lead smelting as in the iron and steel
industries. The work in a lead smelter is done by the day and is
often intermittent, though hard and rapid work may have to be
done at times on any job. When the contract system is followed,
the men naturally work harder and the unloading and loading of cars,
the molding of bullion, and the cleaning of flues is often contract
work. On the ore hearths it is piecework. At the blast furnace
front and at hand-rabbled reverberatories and on the ore hearths
the work is hot and strenuous. On the whole, the most dangerous
and exhausting labor is that of the ore-hearth men.
1Dangerous Trades, p. 28fi.

31080°—Bull. 114—14------4



50

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

In considering the dangers of the smelting industry, it must not
be forgotten that it is peculiarly liable to upsets, to accidents, and
emergencies of all kinds. To quote again from a practical smelting
expert:
In lead smelting there is a normal and ordinary course which the work is supposed
to follow, but there are also periods of time, sometimes short, sometimes long, when
accidents occur, adverse circumstances arise, and conditions alter. Such times are
at the burnings out of furnaces and settlers, when hangs are heavy and the furnaces
crowded, or when arsenical flue dust, is being concentrated in furnaces, or when
accidents happen to flues and fans and bag houses, or when bad materials impair
the normal working of the furnaces. Sometimes the foremen and the superintendents
do not know or do not care about thoso disturbances of the normal working of the
plant. The management of most plants is often considerably out of touch with the
actual working conditions, especially during the night shift, when much of the ugly
work is done. At such times the men often suffer seriously, and instead of bettering
conditions some plants put up with a continually shifting gang of men, new ones
falling into the trap and all avoiding certain particular jobs as much as possible.

RELATIVE

DANGERS OF BREATHING LEAD DUST AND OP
GETTING LEAD ON FOOD.

Experts in Great Britain, Germany, and Austria are agreed that
in lead smelting and refining the danger comes, not from lead which
adheres to the skin and is carried into the mouth with food or tobacco,
not from lack of personal cleanliness, but from the presence of dust and
fumes in the air. Personal cleanliness is not nearly so important
in this industry as in industries which involve the handling of large
quantities of soluble lead salts, such as the basic carbonate (white
lead), or the oxides (red lead and litharge).1 Collis, medical inspector
of factories in Great Britain, says “ Handling of lead may be prac­
tically disregarded as a source of trouble in these trades. ” 2 Laureck
in WeyPs Handbuch der Arbeiterkrankheiten says “ Unquestionably
the greatest danger is the contamination of air by lead dust and lead
fumes.” 3 Yet, strangely enough, in the United States both physi­
cians and laymen connected with lead-smelting plants almost inva­
riably lay far greater stress on the danger of uncleanliness on the part
of the workman than on anything in his surroundings. Chargemen
on feed floors with leaking stacks, workmen tapping matte and lead
from the blast furnace, men working in clouds of dust at the pots or
the roast and sinter machines, all are supposed to get leaded from
1 In the United States the roasting of oxides to form red lead and litharge is a separate industry, while
in England, Germany, and Austria it is carried on together with lead smelting. Am ong the 20 plants
studied in the United States only 1 makes oxides on a large scale. In the others litharge is produced in
the dezincing processes in refineries, but nowhere else. From foreign statistics it is evident that the mak­
ing of oxides is more productive of lead poisoning than m ost of the processes of lead smelting. Thus, in
Austria, in 1901 to 1903, there was 1 case of lead poisoning to every 15.1 men engaged in smelting, but 1
to every 2.9 men engaged in making white lead and oxides. (Grotjahn und Kaup H andworterbuch der
Bozialen Hygiene, vol. 2, p. 275.)
2 Lead Smelting. Special R eport on Dangerous or Injurious Processes in the Smelting of Materials Con­
taining Lead. B y Edgar L . Collis, M. B ., H . M. medical inspector of factories, 1910, p. 6.
* Krankheiten der Arbeiter in Blei-, Silber-, Zink- und Quecksilberhiitten, by P. Laureck. In W e yl’s
H andbuch der Arbeiterkrankheiten, pp. 33-67.




LEAD POISONING IN SMELTING AND REFINING LEAD.

51

eating their lunch without washing their hands and faces. One argu­
ment against this view seems to have escaped those who hold it.
The product handled in a smelter or refinery gets richer in lead as it
goes through successive processes, and therefore the dust that adheres
to the skin has more lead toward the end than at the beginning. By
the time it reaches the refiners and desilverers it is practically pure
lead, and so there should be much more lead poisoning in this depart­
ment than in the mill, or in charging, or in breaking up the roasted
ore, or in blast-furnace work, where the dust has only a relatively
small proportion of lead; yet every practical smelting expert knows
that refining and desilvering are about the safest kinds of work in
the whole plant.
These figures that were prepared by E. Toth and quoted in Leymann’s Bekampfung der Bleigefahr in der Industrie (p. 242) show
the amount of lead found in the water in wlrch men employed in
different kinds of work in a smelter had washed their hands at the
end of the day’s work. Toth had them use not only soap but dilute
acetic acid, so the amount of lead in the water is greater than that
which would be found after ordinary washing.
AM OU N T OF L E A D FO U N D IN W A T E R IN W H IC H MEN E M P L O Y E D IN A S M E L T E R
H A D W A S H E D T H E IR H A N D S A T T H E E N D OF T H E D A Y ’S W O R K , B Y C H A R A C T E R
OF W O R K

Character of work.

Furnace m en . . . . ...... ................
Mixing charges.......... ..................1
Shoveling charges............ ......... '
Refining.........................................j
Cupelling..................... ..................\

First man.

Second
man.

G r a ms.

Grams.

0.1286
. 1648
. 1776
. 2589
. 2924

0.1591
.2288
. 1995
.3238
. 3563

Muller goes thoroughly into the question of the comparative danger
of lead carried into the mouth from dirty fingers and of lead contained
in the dust and fume in the air. He found the lead content of 1
cubic meter of air in the flue over the slag tap at the level of the work­
man’s mouth to be 1.184 g. Estimating that this would be diluted
about five times at the tapping platform he calculates that there
would be 0.2368 g. in each cubic meter breathed by the tapper. As
a man breathes about 0.45 cubic meters in an hour or 4.5 in 10 hours,
the tapper would breathe in 1.0625 g. in the course of a 10-hour day.
On the other hand, Muller collected from the hands of one man
working on the tap floor only 0.0876 g. and from another 0.032 g. at
the end of 10 hours’ work.1
Now, assuming that all this quantity would be on a man’s hands,
not only at the end of the day, but before each of two meals, and
1 The difference between his figures and those of T oth is explained by the fact that T o th ’s subjects used
dilute acetic acid and Muller’s only soap and water.




52

BULLETIN OF THE BUBEAU OF LABOR STATISTICS.

that every bit of it should get into his food (obviously an impossi­
bility unless the man should literally wash his hands in his soup or
coffee) he would still get only 0.1752 g. or 0.064 g. of lead in this way.
How significant these quantities are it is difficult to say, inasmuch
as some men are very susceptible to lead and succumb to a compara­
tively small amount while others are resistant even to large quantities.
Teleky stated in 1912 at the meeting of the Council of the Institute
of Industrial Hygiene that a daily dose of rather more than 0.001 g.
for several months may lead to symptoms of lead poisoning, while a
daily dose of 0.1 g. may lead to severe symptoms in a few weeks.1
Other analyses of air and dust taken from different parts of a smel­
ter are given in the Austrian report already frequently quoted.2 Flue
dust is, of course, richer in lead than any other.
Charging floor, blast furnace 0.4 mg. in 28 liters of air. The dust
on a ledge here contained 19.7 per cent lead (estimated as oxide).
Tapping floor, blast furnace, 0.3 mg. in 28 liters of air, 14 per cent
in dust.
Cupels and retorts, 0.4 mg. in 28 liters of air, 9.3 per cent in dust.
Grinding and crushing roasted ore, 29.3 per cent lead in the air.
Dust chamber, 42 per cent lead in the air, 68 per cent in the dust.
Collis 3 quotes Hofman’s analyses of dust and fumes in lead smelt­
ing, omitting from the list constituents that are of no hygienic
importance.
ANALYSIS OF DUST AND FUMES.
P E R C E N T A G E OF POISON OU S C H EM ICALS IN D U ST A N D FU M ES F R O M V A R IO U S
SOU RCES.

Material analyzed.

All dust collected in 10 years, average...........................
Dust from—
D ow n comers of 11 blast furnaces...........................
R oof of blast-furnace building..................................
Hood above slag tap....................................................
Fumes from—
Slag pot while boiling.................................................
Reverberatory settling furnace.................................
Flue dust from—
Friedrichshiitte, Silesia..............................................
Pribram, Bohem ia......................................................
A ..
Freiberg, S axony................................................ -IB..

j

Arsenic.

Arsenious
oxide.

Lead.

Lead
m on­
oxide.

Lead
sulphate.

P e r cent.

P e r cent.

P e r cent.

P e r cent.

P e r cent.

25.6
47.5
27.1
28.5

27.1

4.8

41.0
31.0

26 2

2.3

62.8
45.5

1.0
7.5
37.5
46.4

Flue dust from—
Omaha and Grant W orks, Denver..........................

Ib
Globe W orks, Denver........................................i c ”
Id

0.6

.3
.3

26.2
21.3
16.2
57.3

15.8
18.7
12.6
5.1
19.4

1 Teleky Protokoll der Sitzung des grossen Rates des Institutes fur Gewerbehygiene, 1912, p. 15.
2 K. k. Arbeitsstatistisches A m t im Handelsministerium: Bleivergiftungen in Hiittenmensehen und
gewerbliche Betrieben. W ien, 1905.
3Lead Smelting. Special R eport on Dangerous or Injurious Processes in the Smelting of Materials
Containing Lead. B y Edgar L. Collis, H. B ., H. M. m edical inspector of factories, 1910, p. 9.




LEAD POISONING IN SMELTING AND REFINING LEAD.

53

In spite of the fact that almost every manager and physician of a
smelting or refining plant lays the responsibility for what lead poison­
ing there is among his men to their own carelessness, because they
will not wash before they eat, it is the exception to find any proper
provision made for this washing which is regarded as so essential.
The men are not supposed to go home during their working time;
if they eat any lunch, it must be in or near their place of work, so
that in the majority of cases they must choose between fasting or
eating with unwashed hands and face, for there is no place where they
can wash properly. The men in the blast furnace department can
almost always use the hot water which runs out from the water
jackets of the furnaces, and if they provide themselves with soap and
towels these men can get clean. In the smelter at Salida the hot
water from the furnaces has been made to flow through big wooden
troughs, which are very convenient places for the men to wash. But
in one large smelter the hot water is conducted away in pipes and the
men can not get at it at all. All they have to wash with is cold water
from the tap.
A few plants have ample washing and bathing facilities and good
lunch rooms. Much the best one so far is that of the NationalLead
Co. at their Collinsville plant. The American Smelting & Refining
Co. is constructing large “ comfort houses” with bathing, washing,
and lunching facilities in their plants at Federal and South Chicago
which will compare favorably with the one in Collinsville. Other
plants which have a good or fairly good equipment are the one at
East Helena where there are small wash rooms and lunch rooms
conveniently scattered through the plant, the refineries at Omaha
and Perth Amboy, the Picher plant at Joplin, and the St. Joseph
plant at Herculaneum. Others have either a less adequate equip­
ment, or one which is designed for flue dustmen only, or none at all.
A safe and abundant supply of drinking water is also a necessity
which has sometimes been neglected. Work in a lead smelter is hard
and hot and the men need drinking water; if it is not supplied they
will bring it in open pails and leave it exposed to the dust. In East
Helena the superintendent of the safety department has had gal­
vanized iron boxes with easily sliding doors placed at a convenient
level on the wall and the pail of water stands inside.
POISONS OTHER THAN LEAD ENCOUNTERED IN LEAD
SMELTING.

Arsenic is an important feature in the smelting plants at Denver
and Midvale and in the refineries at South Chicago and Grasselli, but
it is also present, though in smaller amounts, in the bag-house dust
at Murray, Tooele, East Helena, East Chicago, and Perth Amboy.
It is rarely that one hears of any arsenical poisoning except in the



54

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

form of ulceration of the skin, and when this occurs the men are
promptly changed to other work. Where the flue dust has large
quantities of arsenic, special precautions are always taken, the men
are protected by proper clothing and caps or helmets or hoods, and
either respirators or cloths; they are required to bathe after work
and to eat their lunch in a special room. One case only of severe
arsenical poisoning with systemic symptoms was reported. This
was a Montenegrin employed in the bag house of a western smelter.
He had a severe case of arseniqal neuritis which nearly proved fatal.
Although so few cases of arsenical poisoning have been noted,
several physicians say that they sometimes suspect arsenic as a com­
plication of lead, but it is impossible to be certain of it.
Concerning the part played by antimony in causing disease in this
industry, nothing positive can be said, for the arsenic, which is present
at the same time, masks the effect of antimony.
LEAD POISONING IN THE SMELTING INDUSTRY IN GREAT
BRITAIN, GERM ANY, AND AUSTRIA.

The record of lead poisoning in Great Britain is to be found in the
report of the chief medical inspector of factories and workshops for the
year 1912. Among 2,404 men engaged in the smelting of metals
there were 56 cases of plumbism or about 2 per 100 employed.1 The
zinc-smelting industry, however, was responsible for an undue pro­
portion of these cases. Dr. T. M. Legge, chief medical inspector,
informs us that 395 of the 2,404 men were engaged in the smelt­
ing of zinc and that 19 of the 56 cases occurred among them.
This would give 37 cases for 2,009 men engaged in lead smelting,
which means a rate of only 1.8 per 100. This is decidedly lower
than the rates in most German and Austrian smelters. According
to Collis there was an increase in the number of reported cases of
plumbism in the smelting of metals during 1908 and 1909. The aver­
age for the eight years previous to 1908 was 34.4 cases per year, then
in 1908 there were 70 cases and in 1909, 66.2 The 56 cases of 1911
show that the number is falling again.
Lead smelting has long been regarded as a very dangerous trade in
both Germany and Austria, and the early records show that lead
poisoning used to be appallingly frequent 20 years ago. Since then
both the German and the Austrian Governments have brought the
industry under regulation and there has been a marked lessening of
lead poisoning of late years, although certain plants in those coun­
tries still have a high rate. In no European country is the smelting
of lead as important an industry as it is with us. According to the
1 Annual Report of the Chief Inspector of Factories and Workshops for the year 1912, pp. 198, 205.
2 Lead Smelting. Special Report on Dangerous or Injurious Processes in the Smelting of Materials
Containing Lead. B y Edgar L. Collis, H. B ., H. M. m edical inspector of factories, 1910, p. 1.




LEAD POISONING IN SMELTING AND REFINING LEAD.

55

figures given by the Metallurgische Gesellsehaft of Frankfort-on-theMain1 the world production of lead in 1904 was 926,000 English tons,
of which 284,700 tons came from North America, 190,000 tons from
Spain, and 137,500 tons from Germany. Less than this was produced
in Austria and in Great Britain.
It does not seem possible to find a full report of lead poisoning in
this industry in Germany during recent years. The last volume of
the factory inspection report (Jahresberichte der Gewerbeaufsichtsbeamten u. Bergbehorden) is for the year 1911 and gives informa­
tion with regard to only a few plants. The Eoyal Friedrichshutte in
Tarnowitz, employing 581 men, had not one case of lead colic during
the year, while the Walter Croneck plant, employing 217 men, had
23 cases, a rate of 10.6 per 100. The report goes on to state that
among the 798 men employed in both plants together there were 80
cases of gastritis and 62 of rheumatism; these are affections which in
many reports would be classed as forms of plumbism. In another
plant, in the district of Wiesbaden, there were 65 cases of lead colic in a
force of 387 men, and in a fourth plant in the same district 13 cases
among 115 men, this last having about the same rate as the Walter
Croneck plant, 11 per 100. In the last two plants there was an
increase over the record of the year before which was attributed to
the introduction of converter roasting in which the breaking up of
the caked ore causes much dangerous dust.
The Austro-Hungarian Government in 1903 ordered an investiga­
tion of lead poisoning in the smelting industry and the results of the
labors of the commission appointed for this purpose were published
in 1905. Very full descriptions are given of several smelters together
with analyses of dust and fumes, and the records of physicians con­
cerning lead colic and other forms of plumbism in these plants. In
the Pribram works the records for the 10 years from 1894 to 1903, in­
clusive, show an average of only 39 cases of lead colic and of chronic'
gastric catarrh and chronic constipation, diseases which are probably
plumbic in origin. This would be a rate of only 9 per 100 employed.2
In Gailitz where the dangerous ore hearth method is used there is a
rate so low that it can be explained only by the short working day on
the hearths and the fact that the physician in charge suspends from
furnace work all men who have lost appetite and puts them on out­
door work. In 1899 there were 14 cases of lead colic among 61
employees in this plant and no less than 94 cases of possible lead
poisoning (gastric catarrh or intestinal catarrh or anemia), but in
1903 there was not one case of colic among 49 men and the suspected
cases were reduced to 18.3
1 Krankheiten der Arbeiter in Blei-, Silber-, Zink und Quicksilberhutten, b y P . Laureck. In W e y l’s
H andbuch der Arbeiter Krankheiten, p. 33.
2 K . k. Arbeits statistisches A m t im Handelsministerium. Bleivergiftungen in hiittenmannischen u.
gewerblichen Be'rieben. Teil I, p. 14.
3 Idem , p. 27.




56

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

The Sclieriau smelter has a very different record. Here there were
39 cases of lead colic among the 153 men employed in 1903, or 25 per
100. The report states that this plant suffers from the disadvantage
of a poor and shifting class of labor, but it is evident also that exten­
sive alterations in old buildings and a tardy installation of washing
facilities played some part in the trouble.1
In German smelters the work is divided for the most part into two
shifts of 12 hours each with 24 hours of work every second w^eek
when the shift changes. The report of the factory inspector for the
Aix-la-Chapelle district makes mention of an 8-hour shift, but on the
blast furnaces only. Thus in one plant, 128 men are said to have
worked 12 hours and 25 men 8 hours. Austrian smelters work in 3
shifts of 8 hours, except the men who form what we would call the
yard gang, who have a 10-hour day as with us. The 6-hour shifts of
the Aus trian ore-hearth men have already been described.
Certain of the foreign plants can show a very brilliant improve­
ment in the health of their men at present when compared with
former years. For instance in Pribram the average number of cases
of lead poisoning for the years between 1879 and 1888 was 38.2. From
1894 to 1903 it was 12.9.2 Even better are Toth’s statistics3 of lead
smelting in Schemnitz, Hungary:
CASES OF L E A D PO ISO N IN G AM ON G E M P L O Y E E S OF L E A D S M E L T E R S IN SCH E M N ITZ,
H U N G A R Y , A N D R A T E P E R 100 E M P L O Y E E S F O R S P E C IF IE D Y E A R S , 1895 T O 1905.
!
Year.

Cases of lead poisoning.
|

! Employees.
Number.

1899.......
1901
1902
1903
1904
1905

|
j
1
i
i

386
382
359
296
290
271

241 |
147
166
113
47
40
25
6

Rate per
100 em­
ployees.
73.5
40.5
43.0
29.6
13.0
13.5
8.6
2.2

I

E. J. Neisser4 gives a table showing the incidence of lead colic
in two large German smelters, the royal Friedrichshutte and the
Walter Croneck, the one showing a low and decreasing rate, the other
a high and increasing rate.
1 K . k. A rbeits statistiches A m t in Handelsministerium. Bleivergiftnngen in huttenmannischen u.
gewerblichen Betrieben. Teil I, p. 34.
2 Krankheiten der Arbeiter in Blei-, Silber-. Zink und Quieksilberhiitten, by P. Laureck. In W eyl’s
Handbneh der Arbeiterkrankheiten, p. 38.
3 Quoted in Leymann loc. cit., p. 245.
* Internat. Ubersicht iiber Gewerbhygiene,
5. B eilin, 1907.




57

LEAD POISONING IN SMELTING AND REFINING LEAD.

CASES O F L E A D COLIC AM ONG E M P L O Y E E S OF T W O L A R G E G E R M A N S M E L T E R S , A N D
R A T E P E R 100 E M P L O Y E E S , B Y Y E A R S , 1903 TO 1905.
s
Cases of lead colic.
j
Year. j E m ploy­
ees. ~
Number.

K . Friedrichshiitte:
Roasting and sintering—Huntington-Heberlein p ots...............
Blast furnace........................... . .................... ....................................
Desilvering...... ............. ........................................... . ......................
Retort s and cupels. . . ..................... .............................. ............... .
Other w ork ............... .......................... ..............................................
Walter Croneckhiitte......... ....................... ..............................................

Rate per
100 em­
ployees.

1
1903
1904
1905
1903
1904
1905
1903
1904
1905
1903
1904
1905
1903
1904
1905 j
1903 j
1904 j
1905

86
87
S3
267
232
247
56
73
75
16
15
14
330
309
347
118
143
144

12
8
11
59
24
27
12
4
4
4
1
1
5
4
7
20
69
99

13.9
9.2
13.3
22.1
10 3
10.9
21.4
5. 5
5.3
25.0
0. 7
7.1
i.5
1.3
2.0
16.9
48.2
68.7

This is as great a contrast as can be found in the literature between
two contemporaneous plants in the same country. Neisser attributes
the trouble in the Waiter Oroneck plant to the fact that it is an old,
overcrowded smelter which has not been enlarged as its output has
increased, and w^hich employs large numbers of migratory foreigners.
A German smelter which has shown marked improvement of late
years is that at Ocker in Brunswick. The change after 1900 is to be
attributed chiefly to efficient exhausts which were placed on the
tapping floor.1
CASES OF L E A D COLIC A M O N G E M P L O Y E E S OF S M E L T E R S A T O C K E R IN B R U N S W IC K ,
A N D R A T E P E R 100 E M P L O Y E E S , B Y Y E A R S , 1897 TO 1905.




Cases of lead colic.
Y ear.

1897.........
1898.........
1899.........
1900..___
1 9 0 1 ......
1902.........
1903
1904.........
1905.........

E mploy ees.

179
179
177
184
186
189
189
189
189

Number.

Rate per
100 em­
ployees.

20
18
46
7
5
5
6
4
1

11.2
10.1
25.6
3.7
2.5
2.5
3.2
2.0
.j

>Internet. Ubersieht iiber Gewerbehygiene, p. 24.

58
LEAD

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

POISONING

IN

THE SMELTING
UNITED STATES.

INDUSTRY

IN

THE

HISTORICAL.

Everyone who has followed the development of the lead industry in
the United States for many years back asserts that lead poisoning is
far less common in this industry and far less severe than it used to be.
This must be true for many reasons. In the early days, even if some
efforts were made to prevent accidents, practically no attention was
paid to the protection of the men against disease. The industry was
in a very crude condition, and the one thing of importance was to get
furnaces installed and smelt the lead. Naturally the equipment of these
plants was not elaborate. Hoods over furnaces, and flues and bag
houses to catch and recover the fumes are comparatively recent inno­
vations. There must have been much more sickness in the eighties
than there is now; physicians, smelting experts, and old workmen all
testify to this, but it is not easy to prove it.
Physicians who have practiced for many years in these centers have
seldom kept records; and those who have done so have probably altered
their standards as the years went on, and they now record as plumbism
cases which formerly seemed too mild to notice. At least this seems
the only way to account for the fact that, though their records give as
high figures now as in former years, they still insist that there is not
nearly so much lead poisoning as there used to be. For instance, one
western physician could furnish records for 1898 and 1899 and for
1912, which made it possible to compare two dates 14 years apart.
His records contain relatively few cases of plumbism, but many cases
of indigestion and several of myalgia and lumbago. It seemed best
to follow the German and Austrian system and regard these as prob­
ably less typical forms of chronic plumbism.
E M P L O Y E E S ON P A Y R O L L A N D CASES OF PLU M B ISM , M Y A L G IA , A N D IN D IG E S T IO N ,
AS R E P O R T E D B Y A P H Y S IC IA N O F A W E S T E R N P L A N T IN T H E U N IT E D S T A T E S ,
1898, 1899, A N D 1912,

Case:> of —
Year.

1898...............
1899...............
1912...............

Employees,

.................
.................

800-850 !
800-850 ■
I

P lum b­
ism.

Myalgia,

Indiges­
tion.

74
74
52

48
47
93

174
242
197

Total.

296
363
342
1

In spite of this showing he insisted that lead poisoning is not so
common nor so severe as it was in 1898.
In another western plant the records, which go back only to 1906,
show no improvement at all.



59

LEAD POISONING IN SMELTING AND REFINING LEAD.

CASES OF L E A D POISO N IN G IN A W E S T E R N P L A N T IN T H E U N IT E D S T A T E S , A N D
R A T E P E R 100 E M P L O Y E E S , B Y Y E A R S , 1906 TO 1912.

Cases of lead
poisoning.

j

Year,

E m ploy­
ees. '
Number.

1906
1907
1908
1909
1910
1911
1912

......................................................................... ...................
..........................................................................................
.....................................................................................................
...................................................................... - .........................
..........................................................................................
.................................................................................................................. .
......................................................................................

550
550
350-400
350-400
350-400
450-500
450-500

; Rate per
| 100 emj ployees.

65 !
95
67 !
38 |
56 !
84 |

811

n. s

17, 8
16.8
9.5
14.0
16. 8
16. 2

A record which covers 21 years is the. following, which wras kept
throughout by the same physician:
CASES OF L E A D P O IS O N IN G , A C C O R D IN G TO S E V E R I T Y , IN A W E S T E R N P L A N T OF
T H E U N IT E D S T A T E S , A N D R A T E P E R 100 E M P L O Y E E S , F O R S P E C IF IE D Y E A R S , 1891
TO 1912.

Cases of lead poisoning.
Year.

E m ploy­
ees.

Moder­
ate.

Severe.

1891......................................................................
1892......................................................................
1895............................................................... .
1900
.............................................................
1905..................................................... ................
1906 ...................... .............................................
1912 ....................................................................

500
500
500
500
500
500-550
630

8
4
1
1
|
I

55
49
17
19
21
20
41

Mild.

58 !■
80
78 i77
55
90
134

Total.

121
133
97
96
77
110
175

Rate per
100 em ­
ployees .

24.2
26.6
19.4
19.2
15.4
20.0
27.7

At first sight this report does not show any improvement; rather
it shows that the lowest number of cases was reached in 1905, before
the introduction of copper converters, and that since then there has
been a decided increase, but though the number of cases has risen
there has been a great falling off in the number of severe cases. While
in 1891 the severe and moderate numbered more than the mild, in
1906 the mild were more than four times and in 1912 more than three
times as numerous as the moderate and no severe cases at all were
reported, so that this record really shows an improvement.
It does seem to be true that the severe nervous forms of plumbism,
convulsions and insanity, occur very seldom now, at least in those
plants where there are no open hearths. Thus in Denver, Pueblo,
Leadville, Salt Lake City, Omaha, South Chicago, and East Chicago
it was not possible to hear of a single case of convulsions or insanity
that had occurred in 1912, although the physicians had knowTn of
many such cases in former years. Records were found, however,
showing that lead convulsions or insanity still occur in Perth Amboy,



60

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

Newark, Collinsville, Federal, Herculaneum, Joplin, Salida, Tooele,
and East Helena.
Early hospital statistics in the lead-smelting districts are largely
worthless and the only records obtainable which seemed trust­
worthy and significant were those of St. Vincent’s Hospital in Leadville. Lead smelting began at Leaclville in 1877 with one small
smelter and increased rapidly till at the end of 1879 there were 10
to 12 different plants operating, most of them comparatively small
and not employing over 100 men.1 After 1882 the improvement in
smelting practice w7as rapid and plants of inferior design, construction,
and management were eliminated, while the remaining plants enlarged
their operations so that the total number of men employed did not
alter materially. In 1885 there were only 6 plants in operation,
in 1892 only 4, and the following year, during the panic, all closed
down. After that up to the time of this investigation only 1 plant,
the Arkansas Valley, has been operated regularly.
According to Ingalls, by 1885, the smelting works at Leadville
(except the Cummings & Finn smelter) exemplified about as good
practice as there was anywhere at that time. The Arkansas Valley
was always the best and in subsequent years was greatly improved.
During the first few years of lead smelting in Leadville no attention
whatever was paid to hygienic conditions in the plants, but after a
few years the disastrous effects of excessive sickness among the men
began to be felt and efforts were made to improve conditions. It
is only during the last five years, however, that anything really sys­
tematic has been done to eliminate lead poisoning.
The statistics of St. Vincent’s Hospital illustrate this short sketch
of Leadville’s history. They begin in 1879 toward the end of the
year, and in 1880 there were 54 recorded cases of lead poisoning in men
from the smelters and no less than 67 among miners, showing the
nature of the ore mined in the early days. In 1881 the number of cases
from smelters had risen to 109 and in 1882 it reached the highest
point in the hospital records, 424, to which must be added 54 cases
among miners. There were no less than 26 cases in one wreek in
June of that year and 27 in one wTeek in April. The total number of
cases treated in the hospital in 1882 was only 818, so that lead poison­
ing was responsible for more than half of the patients, in spite of the
large number of accidental injuries in those days., The year 1883
had a lower record, 259 out of a total of 459 patients, and 1884 had
only 143. Probably the enormous morbidity of 1882 represents the
culmination of two or three years’ work under wretchedly unhygienic
conditions, while the lessened number in the following years shows
the effect of efforts at improvement in the plants.
1 The author is indebted for these facts to W . R . Ingalls, editor of the Engineering and Mining Journal,
and to L. G. Eakins, of the Colorado -Department of the American Smelting & Refining Co.




LEAD POISONING IN SMELTING AND REFINING LEAD.

61

The records of individual plants during this year, 1882, show the
high rate of plumbism which obtained in those days in certain plants.
The La Plata smelter, which is said to have had an average pay roll
of 250 men, had 198 cases in that year. Cummings & Finn, employing
over 300 men, had 156 cases. These are only the hospital cases,
they do not represent the whole number poisoned.
The figures keep up to between 120 and 240 for several years and
there is no regular or decided diminution till the year after the panic
of 1893. During this year no plants were operated in Leadville, and
the 42 cases treated in the hospital must have been left over from
previous years. After 1894 there was a great depression in both
mining and smelting in Leadville and operations were not resumed
on a large scale for several years, yet we find a steady increase of cases
of lead poisoning, reaching 139 in 1900. Then comes a gradual descent
to 4 cases in 1905 and from then on the figures fluctuate between
8 and 35, the last being the number of cases for 1912. From 1901
only one plant of consequence has operated in Leadville, and in 1912
this plant had an average pay roll of a little less than 300 men.
No one can show from this record that there has been a steady
and consistent improvement in the lead-smelting industry in Lead­
ville as far as the hygiene of the industry is concerned. All that can
be said is that in 1882 a plant employing 250 men had a rate of lead
poisoning of 79 per 100 employed while in 1913 a plant emplojzing
less than 300 men had a rate of about 12 per 100 employed.
It must not be forgotten that these are all hospital cases. We
have no way of knowing the full truth about lead poisoning in this
city either in former years or at present.
NUMBER AND KIND OF OASES FOUND.

In the present investigation records were secured of 1,769 cases of
lead poisoning which occurred during the year 1912 in 19 of the lead
smelting and refining plants visited. The twentieth, a newly erected
refinery, had not been in operation long enough for cases of poisoning
to develop among the men. These 19 factories employ about 7,400
men; that is, 7,400 represents the sum of their average pay rolls. It
does not represent the actual number of men who have entered and
left, or still remain in the employ of these 19 plants.
The cases of lead poisoning were secured from the following sources:
Hospitals, 347 cases; physicians’ records, 1,320 cases; and 102 cases
reported by laymen.
It is not possible with the scanty information which has been ob­
tained to classify these 1,769 cases according to the severity of the
symptoms, but it can be done with a limited number because the
records of a few plants are fairly full. For instance, in one plant,
among 175 cases occurring in 1912, there were no severe ones, 41 were
moderate, and 134 mild. In another, among 81 cases, there were 5
severe, 17 moderate, and 59 mild.



62

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

In a third plant the physician presented a record which had few
cases of lead colic but many cases of diseases which German and
Austrian authorities almost always include in their lists as milder and
less typical forms of plumbism. His 342 cases were divided into:
Lead colic 52, myalgia and lumbago 93, indigestion 197.
A fourth physician had kept account for two months not only of
the severity of the symptoms, but also of the department in which the
man had worked, so that his records show which kinds of work give
rise to the more serious forms of poisoning. Forty-four of his 66
cases were mild, 22 were moderately severe. They were distributed
as follows:
CASES O F L E A D P O IS O N IN G R E C O R D E D B Y TH E P H Y S IC IA N O F A C E R T A IN P L A N T
IN T H E U N IT E D S T A T E S , A C C O R D IN G TO S E V E R IT Y A N D D E P A R T M E N T IN W H IC H
EM PLOYED.
CASES RECORDED FOR TW O M ONTH S.

Em ployed in—

Handling ore.............................
Mills............................................
Sintering...........................
Blast furnace:
Feeding.. ..
. . .
T appin g..............................
Settling furnace and slag
d u m p .......................................
Converters..................................
B ag house..................................
Motor m en.................................
Mechanics, repairers, furnace
wreckers........................

Moder­
ately
severe.

I
i

Mild.

Total cases.|

i
6

2
2

4
4

(5

2
11

10

21

3
3
2
2

6

3
1

6

3
3
2

1

5

6

22

44

66

It is easier to get information covering the cases of encephalopathy
(convulsions, delirium, insanity) because they are unusual enough to
arrest the attention of the physician and remain in his memory; the
same is true of the more pronounced and lasting forms of palsy. It
was possible to gather information concerning 41 cases of convulsions
or delirium, some of them followed by temporary insanity, 12 of them
ending fatally. These all occurred in 1912. It was also possible to
obtain records of 35 cases of severe and more or less persistent palsy
of the extensors of the arms. Thirty-two of the cases of encephalop­
athy were reported by physicians, 9 by laymen; 29 of the cases of
palsy by physicians and 6 by laymen. The 61 cases of severe nervous
derangement reported by doctors would represent 3.7 per cent of the
1,667 cases which came from professional sources.
The only plants in which there are records of more than a rare case
of encephalopathy are the three which have open hearths. Twentyone of the 32 cases of this form of plumbism reported by physicians
came from these three plants and 8 of the 9 reported by the men,
leaving only 12 for all the other plants. The cases of palsy also came
chiefly from these same plants, 15 of the 29 from medical sources and
4 of the 6 from lay sources.



63

LEAD POISONING IN SMELTING AND REFINING LEAD.

In a study of lead poisoning in the white and red lead industry 1 it
was noted that Negroes appeared to be more susceptible to the
nervous forms of plumbism than white men. This seems to be borne
out by the records of encephalopathy in lead smelting. Only one of
the plants reporting; encephalopathy employs Negroes to any extent.
This is one of the Scotch hearth plants and it would be expected that
a larger number of such cases would be found here than in those
plants in which this very dangerous kind of smelting is not used.
Still, comparing the record of this smelter with those of the other two
smelters in which there are Scotch hearths, the number of cases of
encephalopathy is found to be large. The number of employees and
the number of reported cases of encephalopathy in three Scotch
hearth plants is shown by the following table:
CASES OF E N C E P H X L O P A T H Y R E P O R T E D A M O N G W H IT E A N D N E G R O E M P L O Y E E S
IN 3 SCOTCH H E A R T H P L A N T S IN 2 Y E A R S .
Cases of encepha­
lopathy.
Race.

W h ite........................................................................................ ................................
N egro.......................... ..............................................................................................

E m ploy­
ees.

875
110

Number.

Rate per
100 em­
ployees
per year.

22
15

1.1
6.8

The Negroes were all employed in one smelter which has Scotch
hearths, a sublimed white lead plant, and an extensive bag-house
system. Seventy-five of the Scotch hearth men were Negroes, and
35 were white. The 45 sublimed lead men were white, and the flue
and bag-house work was done by white men, this requiring 4 men all
the time, and a much larger number at intervals. Thus 75 Negroes
and at least 84 white men were employed in the three most dangerous
divisions of the plant. The following shows the relative incidence
of encephalopathy among the Negroes and whites:
CASES OF E N C E P H A L O P A T H Y R E P O R T E D AMONG W H IT E A N D N E G R O E M P L O Y E E S
IN T H E MOST D A N G E R O U S DIV ISIO N S OF A SCOTCH H E A R T H P L A N T IN 2 Y E A R S .
Cases of encepha­
lopathy.
Race.

W h ite.................... ................................................................... ................................
N egro.... ................................................................ .................................................

E m ploy­
ees.

84
75

i

Number.

Rate per
100 em­
ployees
per year.

4
15

2.4
10.0

Doctors in this town and the foremen and workmen in the plant all
agreed in saying that the Negroes were more liable to this form of lead
i Journal of the American Medical Association, 1912, vol. 59, p. 777.




64

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

poisoning than the whites, and this is the only town in w'hich “ lead
fits” is a term in common use. That the Negroes are given to alco­
holism is, of course, true in many instances, but they are said to be not
as heavy drinkers on the wrhole as are some of the whites employed in
this smelter, especially the American born, so that their susceptibility
to lead poisoning of the central nervous system can not be explained
on this ground.
It would be a mistake to draw any conclusions as to the cases of palsy
on our list because the only ones reported wrere the striking and pro­
nounced cases.
As has been found in other lead trades which employ a shifting class
of workmen, unskilled or semiskilled, poorly paid, and therefore not
bound to their trade, fatalities from lead poisoning are not numerous.
A severe attack of colic is usually enough to make a man employed in
lead smelting quit the work, and chronic plumbism is not nearly so
frequent as it is in a skilled trade, such as painting or the glazing of
pottery. Only 16 fatal cases were gathered during this inquiry, 8 from
hospitals’ or doctors’ records, and 8 from the men, all having occurred
during 1912. The 8 deaths reported by laymen are, of course, not free
from doubt as are those obtained from physicians, yet they can not be
absolutely rejected, for all but one came from the employees of two
plants in which it was impossible to obtain any information from the
physicians in charge. The reports wrere given by priests, by fellow
workmen, and by relatives, and were apparently accurate. The
eighth death was reported by the man’s sister. He had been em­
ployed on an open hearth, had fallen in convulsions in the street one
day as he was returning from work, had then gone to the cou n ty to
recover, and died shortly after in a second convulsion.
The 16 fatalities were scattered through 8 plants, the 3 openhearth smelters being responsible for 9.
PERIOD OF EXPOSURE AND ATTACK RATE.

Whenever it was possible to obtain interviews with men who had
had lead poisoning, they were questioned as to the length of time
they had worked before they first began to suffer from symptoms of
poisoning. The following statement shows the period of exposure
of 167 cases of lead poisoning in this industry:
Lessthan 1 month.........................................................................................
1 and less than 2 months..............................................................................
2 and less than 3 months..............................................................................
3 and less than 4 months..............................................................................
4 and less than 5 months.............................................. ...............................
5 and less than 6 months.................................................................. ............
6 and less than 12 months............................................................ - .............




Total, less than 1 year.

18
19
22

33
17
12
11

65

LEAD POISONING IN SMELTING AND REFINING LEAD.

1 year and less than 2 years......................................................................... 16
2 and less than 3 years..................................................................................
8
3 and less than 4 years..................................................................................
4
4 and less than 5 years..................................................................................
1
5 and less than 6 years..................................................................................
2
6 and less than 7 years..........................................................................................
7 and less than 8 years..................................................................................
3
8 and less than 9 years..........................................................................................
9 and less than 10 years........................................................................................
Over 10 (30) years..........................................................................................
1
Total, over 1 year...............................................................................

35

There were two plants, one a small refinery and the other a smelter
with ore hearths, in which information was available as to the length
of employment of the men who showed evidence of plumbism and of
those who did not. This is given in the following table:
L E N G T H O F E M P L O Y M E N T OF M EN W H O S H O W E D A N D W H O D ID N O T SH OW
E V ID E N C E OF P L U M B ISM , IN A S M A LL R E F I N E R Y A N D IN A S M E L T E R W IT H O R E
HEARTHS.

Men with signs of plum bism.
Em ployed—

Smelting. Refining.

Less than 1 m on th . .
1 to 6 m onths............
6 to 12 m onths..........
1 to 2 years................
2 to 5 years.................
5 to 10 years...............
10 to 15 years.............
15 to 20 years.............
Over 20 years............

1
4
3
5
13
15
12
5
4

T otal................

62

1
4
4
7
1
17

Normal men.
Total.

E m p lo y e d -

Smelting. Refining.

1
4
3
6
17
19
19
6
4

Less than 1 m onth.
1 to 6 m onths..........
6 to 12 m onths........
1 to 2 years...............
2 to 5 years...............
5 to 10 years.............
10 to 15 years...........
15 to 20 years...........
Over 20 years..........

34
21
2
8
21
14
2
3
3

2
3
2
4
7
1

79

T ota l..............

108

20

1

Total.
36
24
4
12
28
15
2
4
3
128

Only 8 out of 79 positive cases, or 10.1 per cent, had worked less
than 1 year, and 64 of the 128 negative cases, or 50 per cent. For
the period of 10 years and over, the rates are 36.7 per cent for the
positive cases and only 7 per cent for the negative. Still, 3 men who
had worked for more than 20 years did not even show the lead line.
When these figures are compared with the figures which show
the period of exposure of 167 cases of lead poisoning, a wide diver­
gence is seen, but in that case the information came from 167
men who were suffering from acute lead poisoning, most of whom
had already quit work when they came under notice, while in this
case we have to do with a working force actually employed at the
time, the majority of those affected showing evidence of chronic, not
acute, plumbism.
31080°— Bull. 141— 14------ 5




66

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

The attack rate of 143 men was as follows:
1 attack only..................................................................................... .............
2 attacks........................................................................................... ...............
3 attacks........................................................................................... ...............
4 attacks...........................................................................................................
5 attacks...........................................................................................................
6 attacks...........................................................................................................
7 attacks.......................... .................................................................................
8 attacks...........................................................................................................
More than 10 attacks.....................................................................................
“ Many attacks,” “ several attacks/’ etc..................................................

73
14
16
4
1
1
2
1
5
26

Total...................................................................................................... 143
RELATIVE DANGER OF DIFFERENT KINDS OF WORK.

There is just one plant where records have been made of the phys­
ical condition of the men in the different departments showing which
kind of work has the greatest attendant risk of lead poisoning. The
figures given do not represent attacks of acute poisoning; they repre­
sent the number of men who, on medical examination, were found
to show signs of chronic plumbism.
At the time the plant was visited, 232 men had been recently exam­
ined, but 42 of them had worked only one month or less than a month,
and in the case of 16 the employment was not distinctly stated,
leaving 174 men, distributed as follows:
CASES OF PLU M B ISM A N D R A T E P E R 100 E M P L O Y E E S IN A C E R T A IN P L A N T
V IS IT E D A C C O R D IN G TO C H A R A C T E R OF W O R K P E R F O R M E D .

Cases of plum bism.
Occupation.

Yard gang, unloading, wheeling charges, e tc ......................................................
Furnaces.... .................................................................................................................
Bag house and flues..................................................................................................
Miscellaneous refining, repairing, masons, e tc....................................................

N umber
exam­
ined.
Number.

26
119
8
21

5
37
5
3

Rate per
100 em­
ployees.
19.2
31.1
62.5
14.3

This was only about one-half the force, and the number of men
under the different headings do not represent the actual proportion
of men employed in the different departments, for they were not
examined in any particular order. The blast furnaces here are poorly
hooded and dangerous, but the flue and bag-house men are the
worst sufferers in the plant.
Out of 174 men examined in this plant, 66 had the lead line, 63
had pronounced anemia, 50 a history of recent colic, and 1 1 a his­
tory of colic more than a year ago. Five had palsy and one a history
of palsy.



67

LEAD POISONING IN SMELTING AND REFINING LEAD.

Another record which throws light on the danger of different kinds
of work was kept during two months of 1913 in a plant employing
regularly 622 men. Sixty-five cases of plumbism occurred in those
two months. The men were employed as follows:
CASES O F P L U M B ISM A N D R A T E P E R 100 E M P L O Y E E S D U R IN G T W O M O N T H S OF 1913,
B Y DEPARTM ENTS.

Cases of plumbism.
Department.

Mills crushing and sam pling..................................................................................
Sintering.................... ................................................ ........................ .....................
Blast furnace feeding................................................................................................
Blastfurnace tapping ................... . ........................................ .........................
Settling furnace and slag d u m p .............................................................................
Converters
..........................................................................................................
Miscellaneous
..............................................................................................
Bag h o u s e .......................................- .......................................................................

Number
em­
ployed. Num ber. R ate per
100 em­
ployees.
42
45
60
35
90
18
45
280
7

6
6
6
7
21
6
3
7
3

14.3
13.3
10.0
20.0
23.3
33.3
6.7
2.5
42.9

These would be high rates for a whole year, and this record covers
only two months.
The following shows the record for 1905 in the different depart­
ments of the German smelter at Tarnowitz, the Friedrichshutte.1
CASES OF PLU M B ISM A N D R A T E P E R 100 E M P L O Y E E S IN THE GERMAN S M E L T E R A T
T A R N O W IT Z , B Y D E P A R T M E N T S , 1905.
Cases of plumbism.
Department.

Sintering, H . H. p o t s .................... .................... . . . . . . . . . . . . . . . . . . . ..... .........
Blast furnace...........................................................................................................
Desilvering, refining, cupeling, etc ..................................... ............................
Miscellaneous..........................................................................................................
Total

..........................................................................................................

N um ber
em ­
ployed.

Number.

Rate per
100 em­
ployees.

83
247
75
14
347

11
27
4
1
7

13.3
10.9
5.3
7.1
2.0

766

50

6.5

In Collis’s report of an examination of men engaged in different
processes in smelting it is shown that the men at the furnaces had
a shorter average duration of employment and a larger percentage
of them had the lead line than was true of the general laborers or
the men at the melting pot. The general laborers suffered more than
the others from impaired extensor strength in the forearms, the
furnace men coming next. Men at the melting pot had the longest
average duration of employment.2
1 Krankheiten der A rbiter in Blei-, Silber-, Zinh und Quecksilberhiitten, b y P . Laureck. In W e y l’s
H andbuch der Arbeiterkrankheiten, p. 37.
2 Lead Smelting. Special R eport on Dangerous or Injurious Processes in the Smelting of Materials con­
taining Lead. B y Edgar L . Collis, H . B ., H. M. medical inspector of factories, 1910> p . 6.




68

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

INFLUENCE OF THE SEASONS.

There is a decided seasonal variation in the incidence of lead
poisoning in this industry. If we plot a curve based on the three
heaviest months in each of 33 hospital years, or if we make the
curve represent the months in which 2,847 hospital cases occurred
we arrive at the same result. The highest points are reached in
January and June. It is not easy to discover the reason for this
curve. Physicians and superintendents explain the rise during the
fall months as due to the onset of cold weather, causing the men to
close windows and doors, to stay near the furnaces for warmth, and
to eat their lunch indoors instead of outdoors. As for the summer
rise, they are usually ready enough to explain it on the ground of
greater skin absorption during hot weather, but if that were the case
then July and August should show even higher numbers than June.
The most probable explanation seems to be that these June cases
are the acute cases of poisoning which occur among newly hired
employees. During the spring there is a great exodus of the regular
force from these smelters, the men going off to work on the farms
or railroads, and there is a corresponding entrance of new men,
some of them very susceptible to lead poisoning, most of them
inexperienced and careless. By June they have worked for 8 to 12
weeks, and have become poisoned, for, as has already been shown,
the majority of cases of acute plumbism among lead smelters occur
after less than 4 months' exposure.
One smelting expert suggested that the two crests of the curve
were coincident with the dates of flue-cleaning operations, but a
careful inquiry has failed to show that there is any such regular
periodicity in flue cleaning in the western smelters from which most
of these statistics come.
METHOD OF COLLECTING CASES.

The 1,769 cases given in these lists do not represent all the cases
of lead poisoning which occurred in a year’s time in these 19 plants
because the methods followed in collecting them could not possibly
yield full and accurate results. Hospital records can be looked on
as above criticism, and the 347 cases on our lists are probably all
the cases of plumbism treated by these hospitals during 1912, for
lead poisoning is an old story to the physicians in smelting towns
and it is very improbable that any case escaped diagnosis in the
hospital. But there are only 9 of the 19 plants whose men were
sent to hospitals, except as an unusual emergency, and even these
9 do not send all their cases to the hospital. The less serious ones
are especially likely to be treated outside.



1 Collis, op. cit., p. 6.

LEAD POISONING IN SMELTING AND REFINING LEAD.

69

The next source of information, the records of doctors, is open to
many criticisms. The company doctor who is well trained in diagno­
sis, who examines all the men once a month and writes down the
results, is the only one who can give full information. There are
two refineries in Illinois which are served by doctors of this type
and for these two plants we have entered the number of cases as
given by their records, further search having revealed no additional
cases. One physician outside Illinois had made a thorough exami­
nation of more than one-half of the men employed in the plant and
his records for these men were entirely above criticism. It must be
said, however, that it is difficult to discover all of the cases of lead
poisoning, even with a regular examination, for the very proper pro­
cedure followed by some company doctors of suspending from work a
man who is suspected of plumbism has sometimes the unfortunate
effect of making the men conceal their symptoms. This is especially
true of those who hold the better paid places, such as the ore-hearth
men, who sometimes are found to have been under the care of an out­
side physician for weeks while they were insisting to the company
doctor that they were in perfect health. It is, of course, very diffi­
cult to make a diagnosis of lead poisoning upon observation alone
if the man refuses to admit that he has any symptoms.
In the case of the other 16 plants the physicians do not see all of the
cases of lead poisoning that develop, for they treat only the men who
come to them for advice, and there are some workmen who distrust
the company doctor simply because he is the company doctor. Also
there are foreigners who prefer men of their own nationality and who
will sometimes go off to the nearest city to find one, thus escaping
entirely the notice of the physician employed by the company.
Besides this, the doctor who sees only the men who come to him with
the complaint of illness will fail to include in his records the incipient
cases not yet developed to the point of alarming the patient and also
the chronic cases with minor symptoms. Therefore no physician,
no matter how careful and accurate he is, can report every case
occurring in the plant unless he sees all of the men at regular intervals.
But not all physicians are entirely careful and accurate, and not
all are sufficiently accessible to the men. Some of them do make
frequent, even daily, visits to the plant and may be approached by
the men without any formality. On the other hand, others come
only when they are sent for and the men are supposed to get an order
from their foreman and go to the doctor’s office if they wish to see
him.
It was of course necessary to make a further search for lead poi­
soning in places where the information obtained from the doctor
was very unsatisfactory. Other physicians were visited, and also
apothecaries, priests, and men who were known to have a wide



70

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

acquaintance among certain of the nationalities employed. These
outside physicians could sometimes swell the number of cases very
decidedly, especially in two towns where the company doctors are
disliked and distrusted by the men. For instance, in one of these
towns two doctors gave records of 144xases which had occurred in 15
months’ time in the plant. Though the wage scale in this refinery
is low, as in all refineries, and the men have been obliged to pay for
the services of the company doctor, they are willing to pay again in
order to have a doctor who can speak their language and whom^ they
can trust.
However, few doctors in general practice keep records, and as a
usual thing these outside physicians could not do more than confirm
the investigator’s belief as to the existence of lead poisoning in a
certain plant, for it was considered best not to give the same weight
to general statements as to records of individual cases. Such state­
ments as “ 12 cases a month last year/’ or “ about 40 in the course of a
year,” were noted, but the figures were not included in the statistics
of lead poisoning given in this report. Had that been done the list
would have been increased by some 700 cases, but we could not have
been sure that we were not counting the same case more than once.
The cases gathered from nonprofessional sources which were de­
scribed with enough particularity to seem trustworthy, but which
lack medical confirmation, have been listed separately. They form,
however, less than one-seventeenth of the total number of cases.
Among them are cases reported by priests, who have visited the
men in their sickness and in some instances attended them at
death. These priests could often give inside information as to the
character of the plant, the increase or decrease of accidents and
sickness among the men, and above all as to the relations be­
tween doctor and men. Another good source of information is the
apothecary, especially the Slavic or Hungarian, for he often sees
cases which never reach a physician and he grows fairly skillful
in diagnosis. The remaining cases in this class were reported by the
men themselves or by relatives or by fellow workmen.
Therefore as regards the figures of lead poisoning, given above, we
believe we are justified in claiming that the degree of lead poisoning
among the workmen in these plants is decidedly higher than our
figures show, since the sources of information which were drawn upon
for them were almost always insufficient and since the standard
applied was strict and no doubtful cases were included.
It may be well to give a summary of the records of some of the
physicians attached to smelting plants to show that it is not an over­
estimate when we say that the rate of lead poisoning in the leadsmelting industry is at least 22 in 100.



71

LEAD POISONING IN SMELTING AND REFINING LEAD.
CASES

OF LE A D

PO ISO N IN G A N D R A T E P E R 100 E M P L O Y E E S
PH Y S IC IA N S OF G SM E L T IN G P L A N T S IN 1912.

REPORTED

BY

Cases of lead p oi­
soning.
Plant.

No.
N o.
No.
No.
No.
No.

13..................................................................................................... ......................
17..................................................................................................... .....................
12..................................................................................................... .....................
11...........................................................................................................................
18...........................................................................................................................
20...........................................................................................................................

Average
m onthly
pay roll.

450
660
630
300
600
350

Num ber.

81

120

175
85
204
183

Rate per
em­
ployees.

100

18.0
18.2
27.5
28.3
34.0
52.3

There was a seventh plant which, in a force of 623 men, had 65
cases of lead poisoning in two months7 time. If this rate were kept
up during the year, it would mean 390 eases or about 62.6 per 100,
but we do not know whether this record did persist throughout the
year.
The results of three house-to-house canvasses, which were made in
smelting villages, are pertinent here. Two of the villages were near
smelters with ore hearths, the third near the usual type of smelter
without ore hearths. The houses were visited haphazard and the
men or their wives interviewed in the effort to ascertain whether or
not the man had ever suffered from lead colic or palsy. In the first
village 42 were questioned, of whom 26 gave a history of lead colic
and 3 of palsy as well, while 16 had never been poisoned. In the
second village 21 were interviewed; 12 had had lead colic, 9 had not.
In the third village 17 out of 30 had had colic, 2 of them palsy also,
while 13 had not.
MEDICAL SUPERVISION.

Lead smelting is an industry attended with a certain amount of
risk of accident, and in consequence it has long been the custom of
the employers to engage physicians whose duty at first had to do
chiefly with cases of accidental injury. This system was advan­
tageous to the company in view of possible suits for damages and prob­
ably also to the men since it insured the prompt attention of a sur­
geon who was likely to be one of the best in the town. It was natural
that many of these physicians should gradually come to take charge
of cases of lead poisoning also, and finally of all forms of sickness.
At present every one of the plants which form the subject of this
study has at least one physician who gives more or less regular
attendance to the employees. In a well-managed smelter the physi­
cian comes out at regular intervals to the plant, where he is usually
assigned a room for his use, and he is at the service of any man who
wishes to consult him. No formality is needed beyond the foreman’s
permission for the man to quit work. Often the company has an



72

BULLETIN OP THE BUREAU OF LABOR STATISTICS.

arrangement with some hospital and sends there the serious cases and
those who could not be properly cared for at home, the expenses
being paid out of the sickness insurance fund. Where there is no
hospital, the company doctor attends cases of disabling sickness in
the men’s homes.
The arrangement is not always so good as this. Some physicians
go to the plant only when they are summoned for an accident or for
an acute attack of lead poisoning occurring at the plant. If the men
wish attention, they must get an order from the foreman and go to
a doctor’s office, which may be miles away. No plant was found in
which there was absolutely no provision for medical care, though the
amount and character of the service given varies greatly. There are
some physicians who act only as medical attendants and know
nothing at all about conditions in the plant, who lecture the men
about washing their hands without ever asking if it is possible for
them to do so, and who do not know enough about the work to be able
to say from which department most of the lead poisoning comes.
On the other hand, there are physicians who act as consulting sanitary
experts, who go over the plant frequently, keep track of the men, and
notify the superintendent when any department is sending in an
unusual number of cases.
In their relation to their patients, too, we can find all types of physi­
cians in these plants, from the doctor who is feared and suspected
by the men to the one whom they gladly seek out when they are ill
and call on to take care of their wives and children.
Ignorance and neglect on the part of the company doctor can not
be controlled by legal machinery; it must be in the hands of the
manager, and it is a pity that company officials do not always realize
how important a matter this is, how much the doctor influences the
attitude of the workmen, making them hostile toward their employers
or winning their confidence and loyalty. In talking with workmen
in the privacy of their homes where they can speak freely, one is
always impressed by the large part the doctor plays and the influence
he has on their attitude toward the company.
Of course the employer really wants first-class medical and surgical
service, for he knows that the efficiency of his workmen depends
largely on this, but unfortunately, such service is not an easy thing to
gauge. Thfe results of good sanitation and medical care show them­
selves slowly and seldom with indubitable clearness. They can not be
calculated as can the results of new machinery, and therefore the
neglect or incompetence of the doctor may escape detection by his
employers. It does not occur, for instance, to the manager of a
certain large refinery that there is any connection between the almost
impossible shifting character of his force of Slavic workmen and the
brutal manners of the company doctor, who despises his patients,



LEAD POISONING IN SMELTING AN D-REFINING LEAD.

73

can not speak their language, and gives them the impression that he
cares only to shield the company against possible damage suits.
For thorough medical supervision, there should certainly be regular
inspection of all of the men at stated intervals, as there is in Germany
and in Great Britain.1 But whatever system is adopted, its success
depends on the skill and character of the doctor, and on his character,
perhaps, more than on* his skill. There are plants in Illinois which
with the regular inspection required by the law do not give as good
medical care to the men as do several plants outside Illinois where
such inspection is not practiced. A physician who is not naturally
overthorough, whose sympathies are not easily aroused, and who
knows that his tenure of office depends on superintendent or manager,
may easily fall into careless superficial habits with his patients and
make up for it by scrupulous attention to the company’s interest in
accident suits.
At present the medical service given in these 20 plants may be
classed as excellent in 9, fair in 5, and poor in 6.
SICKNESS AND ACCIDENT INSURANCE.

There is some form of accident and sickness insurance in all these
smelters and refineries, usually the following:
A sum which runs from 60 cents to $1.50 is deducted from the
monthly wage of each man and goes to the insurance fund. Out of
this is paid the salary of the physician and his assistant, if he has one,
the hospital expenses in case the company sends its employees to a
hospital, and half pay for the men who are disabled by accidental
injuries. Men who have industrial lead poisoning do not receive
half pay.
The sum of $1 a month, which is what the men contribute in the
greater number of plants, is often sufficient to cover all expenses,
and the company need not contribute anything. In three plants it
was stated that $1 was ample, while in another the manager stated
that 75 cents a month would be sufficient for all demands and that $1
would mean a surplus. In other plants, however, $1 or even $1.50
is not enough to cover expenses and the company must make a
contribution almost every month.
It is not surprising that the expenses of medical care and insurance
are often fully covered by the men’s contribution when one considers
that it is the custom in the majority of these plants (outside Illinois)
bo collect the- sickness insurance for the whole month during the first
week of a man’s employment. If then he leaves at the end of the
week and another takes his place, the dollar is collected from the
1 For foreign regulations concerning medical care of workers employed in industries involving risk of
lead poisoning, see A ppendix V.




74

B ULLETIN OF THE BUREAU OF LABOR STATISTICS.

latter also, so that it is conceivable that $3 or even $4 may be col­
lected from the successive holders of one job in one month’s time.
As a matter of fact, $1,100 was collected during August, 1913, from
the employees of a lead and copper smelter whose average daily
pay roll is only 835 men.
This system of accident and sickness insurance is singularly gen­
erous to the company, which thus throws back upon the men the
larger part, if not all, of the expense of occupational accident and
disease. The company also selects the doctor, has control of him,
and commands his loyalty, yet is not obliged to pay him anything,
or at the most only a small part of his salary. Nor have the men any
possible redress if the doctor neglects his duty.
There are, however, other methods of managing sickness and
accident insurance. The Illinois occupational disease law, which was
passed in 1911, makes it incumbent on employers to provide for a
monthly medical examination of all the men in their employ who
come in contact with lead or its salts. The physician retained for
this service naturally gives treatment as well. He is, of course, paid
entirely by his employers. The Picher Lead Co. has a system more
like ordinary industrial insurance. The men pay 15 cents weekly
apiece and the company puts in an equal amount for each man. In
this plant not only is medical care given, but a systematic examina­
tion made as in the Illinois plants.
In the International Smelter at Tooele the $1 collected from the
men goes for medical services only, the company paying full wages
to men incapacitated by injury. The doctors hold their positions
only as long as they give satisfaction to the men.
The St. Joseph Lead Co. in Herculaneum employs two physicians
to care for their accident cases. The company has built a dispensary
for them and pays the expenses of all accident cases and of all cases
of sickness which are sent by the doctors to the hospital at Bonne
Terre or to some St. Louis hospital. It is optional with the men
whether or not they will employ these doctors for sickness. If a
man decides to do so, the company deducts $1 monthly from his pay
and gives it to the doctor, and for this sum the man is entitled to
medical care for himself and his family. Practically all the men,
except some of the “ floaters,” avail themselves of this arrangement,
but the mere fact that it is optional, that the men may save that $1
if they choose and go to a doctor in a nearby town, gives them the
normal attitude of patients toward their physician and is certainly
not without its effect on the physician’s attitude toward them. It
would seem fairer, however, for the company to bear at least a share
of the expense of medical treatment, especially in cases of disease
distinctly traceable to the men’s work.



LEAD POISONING IN SMELTING AND REFINING LEAD.

75

CHARACTER OF EMPLOYEES.

The men employed in lead smelting and refining are for the most
part foreign born of different nationalities, often newly arrived immi­
grants unable to speak English and unacquainted with the dangers
of the work they undertake. This does not mean that they do not
know the work is dangerous, for usually they have been warned by
their fellow-countrymen, who have already worked in the plant,
but they have no idea how to protect themselves against the dangers.
On the Atlantic seaboard the men are chiefly Austrian Slavs, and the
same nationalities are found in and around Chicago, with Magyars
in addition. As we go farther west the mixture of nationalities
increases. In the Federal plant near Alton there were in the spring
of 1913 about 200 American-born whites and 25 Negroes, the rest
being Germans, Italians, Slavs, and Greeks. The Italians were
employed at the heaviest work, loading and unloading cars, the
Greeks and Austrians in the yard and on blast furnaces, the negroes
in the refinery, and the American whites on the ore hearths and in
the powerhouse. In Collinsville the employees are Negroes, Americanborn whites, Lithuanians, Italians, Syrians, Mexicans, and Germans.
The Hoyt Metal Co., in Granite City, employs Turks, Armenians,
and Macedonians in addition to other nationalities. At Hercul'aneum
the force consists of a much larger proportion of American-born
whites, some of whom are regular smelters by trade, while some are
farmers working at smelting only in winter. Some of these are
descendants of Washington County French. There are also Slavs,
who form the more shifting part of the force. In Joplin alone the
men are all Americans, many of whom come from Arkansas farms,
work through the cold season, and return home in the spring. This
alternation of employment is excellent for the men’s health, and it is
fairly general in the smelting industry. In Colorado the beet fields
draw the men for the summer months, while the Slavs and Greeks of
Chicago and southern Illinois go off on railroad-extension work.
Leadville, Salida, and Denver have chiefly Austro-Hungarians and
Greeks, with a few Italians and Russians. Pueblo has more Italians
and has also Mexicans. Montenegrins are found in the Utah smelters,
in addition to other southeastern Europeans. In 1911 a census of the
Omaha Smelting & Refining Co. gave the following nationalities:
Italians, 134; Austrians, 82; Hungarians, 85; Americans, 59; Bohe­
mians, 53; Irish, 20; Poles, 18; Swedes, 12; Germans, 11. In 1913
the East Helena plant had 92 Austrians and 44 Americans, the re­
maining 56 men being scattered among no less than 17 different
nationalities. In all these smelters there is always at least a small
proportion of skilled American-born or northern European workmen
holding the better-paid places.



76

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

The force is roughly divided into the yard gang, employed at day
wages for a 9 or 10 hour day (8 hours in Colorado) and the inside men
who work for 8 hours, three shifts, in the western plants and in Perth
Amboy, or for 12 hours, two shifts, in Graselli, East Chicago, South
Chicago, and Newark. In one typical smelting plant the yard gang
numbers 175 to 200, the inside men 90 to 100. In one large refinery
the yard gang, including repairing men, has 300; the converters and
blast furnaces, 250; the refinery, 90.
Wages in the largest eastern plant were given as 20 cents an hour
for men in the yard gang, who work 9 hours, and 25 cents anhourforthe
inside men, who work 8 hours. In East Chicago the day wage is $1.75;
piecework averages $3 a day. In Collinsville and Federal the day
wage is $1.65 to $1.80; the work on the ore hearths, in dust collecting
system, and in unloading cars is piecework, and for this the men are
paid from $2.25 to $3.00 a day. Farther west the wage for day
labor rises, but that for more skilled work hardly changes at all.
Thus, in Herculaneum and in Omaha day laborers are paid $1.65
a day, in Denver $1.75, in Leadville and in Salt Lake City $2, in
Tooele and in East Helena $2.25 or $2.35, while in all these plants
$2.35 to $3 was given as the wage for skilled work. Mechanics,
repairers, plumbers, blacksmiths, etc., are not included here.
Many vague charges of alcoholic excess are brought against the
men employed in lead smelting, but not often by the people who know
them best— their own foremen and employers. That Slavic, Magyar,
Italian, and German workmen drink beer, wine, and even whisky
is readily admitted, but they are not regarded as an intemperate class
of men on the whole, nor are the Negroes. It is really in the plants
where many American workmen are employed that one hears most
complaint of alcoholism, perhaps because American workmen can not
stand alcohol so well as Europeans.
The workers are a very shifting lot of men and even the cash bonus
offered by one large company to men who remain as long as a year
in its employ is not inducement enough to make them stay. This
refinery had succeeded in keeping less than 30 per cent of the force
as long as one year at the time it was visited. Naturally such a
state of things results in far more lead poisoning among the men than
is found in a plant where the workmen remain for years, acquire a
fair amount of skill, and learn the risks to which they are exposed.
The Austrian commission’s report lays especial stress on the danger
of a continually changing personnel, and ascribes the high rate of lead
poisoning in the Scheriau smelter largely to the fact that the labor
employed there is ignorant and shifting. In 1903, 560 men were
taken on in this plant to keep up a monthly pay roll of only 91, and
among the 153 men reported on by the physician there were 39 cases
of lead colic and 31 of gastro-intestinal catarrh.



LEAD POISONING IN SMELTING AND REFINING LEAD.

77

The German, factory inspectors also speak of the trouble arising
from casual workers. In the Walter Croneck smelter, in Silesia, a
certain proportion of the employees come from Ruthenia and, like the
foreign employees in American smelters, they do not understand the
language of the country; they enter the industry only as a temporary
expedient and during the short period that they work they live in
crowded, unsanitary quarters and do not have sufficient food. In
1911, 233 Ruthenians were employed in the Walter Croneck plant
and of these 192 left work and 71 remained at the end of the year.
The native German workmen, numbering 160, had only 9 cases of
lead poisoning, while 60 Ruthenians had 16 cases. This plant
increased its force in 1902 and the increase in lead poisoning was
at once perceptible. In 1901 there were 13 cases among 73 men
(17.8 per cent); in 1902, 35 cases among 129 men (27.1 per cent),
showing that there were susceptible men among the newly employed.1
Although almost all of the managers of American plants complain
of the shifting character of their labor, the condition is worse on the
Atlantic seaboard and in the neighborhood of Chicago and St. Louis
than in western Missouri, Colorado, and Omaha. The following are
some of the statements made by superintendents as to the shifting
character of the men employed by them:
“ From 25 per cent to 30 per cent new men must be employed every
month.”
“ We can not get steady workmen; we are always losing our men,
though we pay more than the usual rate of wages.”
“ Not 30 per cent have been here as long as one year, and those who
do stay average only 20 days’ work a month.”
“ In one month 25 out of 92 men quit work.”
“ Not many of the men stay more than two months. We always
prepare for the semimonthly pay day by sending to the employment
agencies in St. Louis and Chicago.”
“ Six hundred and thirty are employed all the time, but there were
800 on the books last month.”
“ The monthly pay roll is 350, but 100 new men were employed
during August, 25 on the blast furnace alone.”
In only two plants could accurate information be obtained as to
the length of employment of the men then at work. In one, out
of 238 men, 52 had been there less than 1 month, 91 less than 6
months, 106 less than 1 year, while exactly one-half the force, 119
men, had been employed less than 2 years. On the other hand, 75
had been employed over 5 years and 13 over 20 years.
1 Gewerbliche Vergiftungen deren Vorkom men, Erscbeinungen, Behandlung und Verhiitung.
Ram bousek, Leipzig, 1911, p. 156.




J.

78

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

The second plant gave a more detailed report, as follows:
Employed less than 1 year.......................................................................... 298
1 to 2 years......................................................................................................
75
2 to 3 years...................................................................................................... 48
3 to 4 years......................................................................................................
35
4 to 6 years......................................................................................................
39
6 to 8 years......................................................................................................
22
8 to 10 years....................................................................................................
14
10 to 15 years..................................................................................................
15
15 to 20 years..................................................................................................
16
Oyer 20 and under 30 years......................................................................... 53
Over 30 years.................................................................................................. 15

In spite of the large number of casual workers, this is an unusually
good showing, with 68 men employed over 20 years.
It is evident from the records that while none of the managers can
boast of anything like a steady force of workmen, yet some of them
suffer far more than others from the continual shifting. The plants
which are near the big centers of industry naturally have more difficulty
in holding their men than do those which are situated where there is
not so much demand for labor. It is also true, however, that some
of these plants enjoy fair reputations, while others are so notoriously
dangerous that the newly arrived Greek or Slav or Italian is warned
by his fellow countrymen that two months is the longest time he
may safely work there, after which he must look for work in the open
air to get rid of the poison.
In talking with the men employed in two neighboring plants it
was learned that while one plant was receiving many applications for
work from old employees returning from a summer on the farms the
other was actually crippled for lack of men. It was easy to see why
there should be this difference between the two plants, for one was
unusually clean and under the management of an intelligent and
careful man, while the other was one of the two most dangerous plants
to be found in the country.
HOUSING.

In almost every lead smelter there is a large number of foreignborn workmen, who have no families with them, who have taken up
the employment as a temporary thing, and who are eager to save
as much as possible from their wages so that they may send home
for their families or return to them. This part of the force usually
lives close around the smelter, and groups of men of the same
nationality rent a few rooms which they use to the utmost limit per­
mitted by the three-shift system. These rooms are sometimes sur­
prisingly clean and well kept; more often they are as neglected and
dirty as would be expected. Most smelting villages are very unat­
tractive, dreary, and squalid, and the dreary effect is added to by
the sulphurous fumes which escape from the smokestacks of the



LEAD POISONING IN SMELTING AND REFINING LEAD.

79

works, sometimes only at intervals, sometimes almost continuously.
Yet there are some pleasant, prosperous looking smelting villages of
permanent homes, such as the one at Herculaneum, the one at East
Helena, and the Slavic village at Pueblo. It is partly a question of
permanence as against excessive shifting, for a migratory popula­
tion will take little interest in a place of temporary sojourn only,
but it is partly also a question of nationality, as can be seen in the
contrast between the Italian-Mexican village in Pueblo, with its utter
neglect of ordinary cleanliness in the surroundings of the houses, and
the clean attractive Slavic village across the river. As a rule the
smelting companies do not rent houses to their workmen, but in the
three instances where this is done these houses compare very favor­
ably with workingmen’s houses in the neighboring towns, and the
rent is moderate.
COMPULSORY REGISTRATION OF OCCUPATIONAL PLUMBISM,

The effort to collect trustworthy data as to lead poisoning in the
smelting industry showed that no one could expect very much help
from the physicians attached to some of the plants. In the first
place there is absolutely no uniformity of standard among these
physicians as to what constitutes lead poisoning. For instance, one
man reports as a mild case of plumbism a workman with anaemia
and a lead line. This is entirely in accordance with British and
continental usage. Another, however, designates as mild plumbism
a severe attack of colic, constipation, nausea, and vomiting, requiring
medical care for two weeks. Such a case would be classed as moder­
ately severe in British reports, but the American physician in ques­
tion does not consider anything milder than this a reportable case of
lead poisoning.
The relation between physician and employer sometimes interferes
with the effort to obtain full reports of lead poisoning from a plant.
Fleck complains that in Germany there is a tendency on the part of
physicians attached to lead works to spare their employer’s feelings
by keeping the list of cases of lead poisoning low and recording such
diagnoses as “ gastric catarrh” or “ chronic constipation,” or
“ anaemia” instead.
In view of the fact that several States have passed laws requiring
physicians to report to some central office all cases of industrial
plumbism which come to their notice, it may be well to note how the
Illinois law has worked. Illinois requires employers in establish­
ments where lead salts are handled to provide for a monthly medical
examination of all employees exposed to the danger of lead poisoning
and to report all cases of lead poisoning. Missouri has recently made
the same requirement. Similar laws in other States require all



80

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

physicians to report such cases, but do not call for regular medical
inspection.
Physicians and sanitarians have always said that the only way in
which we can hope to gather accurate statistics concerning any
occupational disease incident to the lead industry, such as are avail­
able in Great Britain and continental countries, is to have all the
men who are exposed to lead examined more or less frequently and
a report of the findings sent to some central bureau. It was largely
for this reason that the Illinois law was framed as it was, but the
requirement to report cases unfortunately applies only to the physi­
cians attached to the factories which come under the law. The
experience of Illinois after two years7 operation of this law seems
to show that if we are ever to have trustworthy statistics comparable
with those of other countries it must be with the help of all of the
physicians in the State, and, in addition to this, there must be some
way of checking up reports sent in by the company doctors.
The records of five smelting and refining plants in Illinois con­
cerning which information is available in the chief factory inspector’s
office, were examined in the search for reports of lead poisoning.
For No. 1, the company doctor sent in every month during the last
half of 1912 and the first three months of 1913 reports of the physical
examination of 300 to 400 men with only two cases of plumbism.
Yet this is a plant with ore hearths and a bag house in addition to all
the other dangerous parts of a smelter. Meantime, during 1912,
hospitals in near-by cities had treated 46 cases from this plant, and
physicians had treated 68 cases, making 114 among which were 8
encephalopathies, but none of these reached the factory inspector’s
office. To anyone who knows the smelting industry, whether or not
he has studied medicine, it is incomprehensible how any physician
could examine 165 to 175 ore-hearth men, month after month, without
finding any evidence of lead poisoning.
No. 2 is a contrast to this, yet curiously enough the two plants
belong to the same company. In No. 2 the doctor reported every,
case of profound anaemia, or obstinate constipation, with a lead line,
as plumbism, a carefulness of diagnosis rare even among private
physicians. This plant employs 100 to 125 men.
In No. 3 the policy is very like that followed in No. 1, and the
physician in charge of 350 to 450 men sent to the chief factory in­
spector’s office reports of monthly inspections of all the men,, shoWr­
ing only five cases of lead poisoning during 1912.1 This also is a
plant with ore hearths. Hospital records during 1912 yielded 66
cases from this plant, and physicians reported 33 more, making
1 It is only fair to state that vigorous remonstrances on the part of the chief factory inspector resulted
in a sudden change in January, 1913, and during the next three months 29 cases were reported.




LEAD POISONING IN SMELTING AND REFINING LEAD.

81

99, while 47 additional cases came to the knowledge of the investi­
gators but lacked medical confirmation. Among the 99 cases were
7 encephalopathies, 5 palsies, and 2 deaths.
No. 4 is a contrast to No. 3. It is a small refinery employing only
about 30 men in work which exposes them to lead. The physician
in charge sends monthly records of his examinations giving a list of
negative cases, of all those who show a lead line, and of those with
symptoms of chronic plumbism.
Of No. 5 little need be said. It is a refinery employing 150 men
in the smelting and refining of dross and scrap lead. There is both
dust and fume to an unusual extent in this factory, yet the physician
in charge stated that he had had no case of lead poisoning since he
was employed more than a year ago. Such an assertion needs no
comment.
The working of the Illinois law therefore has not produced the
result that was hoped for. It does not provide the chief factory
inspector’s office with accurate records concerning lead poisoning in
the smelting industry, whatever may be true of other lead industries.
The requirement to report cases of lead poisoning should apply to
all physicians, not alone to those employed by the companies; and it
would be a very good thing if the law should provide also that phy­
sicians connected with the State factory inspector’s office should at
certain intervals go through the plants, examine the men, and check
up the company doctor’s reports. Unless something of this sort is
done we shall never be able to claim that the statistics of occupational
lead poisoning in this industry are trustworthy.
31080°—Bull. 141— 14------ 6




APPENDIXES.

APPENDIX I.— THE SOLUBILITY OF LEAD SULPHIDE ORES
AND OF LEAD SULPHIDE IN HUMAN GASTRIC JUICE.
By A.

W o e lfe l

and A. J.

Car lso n ,

Department of Physiology, University of Chicago.

The following tests of the solubility of lead sulphide ore dust in human gastric juice
were made at the request of Dr. Alice Hamilton, special investigator of occupational
lead poisoning for the United States Bureau of Labor Statistics, who reported to us
that she had found some 25 cases of lead poisoning among men employed in mines
and concentrating mills in southeastern Missouri. The mines in this region are
supposed to yield practically pure galena.
The literature on industrial plumbism usually takes for granted the nonpoisonousness
of lead sulphide in the animal body, though the experimental data on which this belief
is founded are both meager and conflicting. Blum,1 who is the most widely quoted
authority on the subject, found that he could feed animals large quantities of lead
sulphide without apparently producing any injurious effects. Leymann2 says
that the sulphide is the compound found in most of the ore smelted in Germany, and
experience shows that it does not give rise to lead poisoning in workmen—experience
which is confirmed by tests on animals. If there is any danger at all in the handling
of these ores it is so slight as to be practically negligible.
Pambousek,3 at the International Congress of Industrial Hygiene which was
held at Milan in 1906, quoted the work of Leymann and of Blum and confirmed their
opinion as to the nonpoisonous nature of lead sulphide, which he had fed to animals
in large doses without producing any ill effects. He found also that artificial gastric
juice (0.1 per cent HC1 with or without about 1 percent of peptone) had no effect what­
ever on lead sulphide. Biondi 4 opposed this assertion and claimed to have seen
among the galena miners of Sardinia many men who showed the usual signs of lead
absorption. "While severe colic or neuritis is extremely rare among these men, that is
explained by improved hygienic regulations in the mines, since in former years such
phenomena were common enough. On the other hand, Pvambousek cited the sta­
tistics of the galena mines of Pribram in Bohemia, where among 10,000 miners there
was not 1 case of lead poisoning, while among the 4,000 smelters there were 150 cases.
Experimental evidence of the solubility of lead sulphide in the animal body seems
to have been furnished first by Murgia,5 who, after feeding dogs and rabbits with
blende (zinc sulphide) which contained lead sulphide in the proportion of 0.2 per
cent, found traces of lead in both liver and intestines. Recently Brezina and Eugling 6
undertook to study chronic plumbism in animals, basing their conclusions as to lead
absorption on the appearance of basophilic granules in the red blood corpuscles of
the animals in question. The lead compounds were introduced into subcutaneous
1 Wiener Medizinische W ochenschrift, 1904, t o I . 54, pp. 538-543: liber das Schicksal des B lei im Organismus, F. B lum .
2 Leym ann, Bekampfung der Bleigefahr in der Industrie, Jena, 1908, p. 4.
3 Ram bousek, Transactions 1st International Congress for Industrial Diseases, Milan, 1906, p p. 609-617;
also II Ramazzini, 1907, p p . 472, 473.
4 B iondi, Transactions 1st International Congress for Industrial Diseases, Milan, 1906, p p. 293-308; II
Ram azzini, 474-479.
5 Murgia, Clinica Moderna, 1906, No. 27, p. 3i6.
6 W iener Arbeiten aus dem Gebiete der Sozialen Medizin, I I Heft, 1912, vol. 5, pp. 29-34. Untersuchungen iiber experim entelle chronisc-he Bleivergiftung. E. Brezina und M. Eugling.
82




83

LEAD POISONING IN SMELTING AND REFINING LEAD.

pockets, were rubbed into the shaved skin with lanoline ointment, and finally were
mixed with the food. The animals selected were guinea pigs. The characteristic stip­
pling of the cells appeared in the animals treated with lead sulphide more quickly
and in larger numbers than in those which were treated with lead sulphate.
The general plan of the present series of tests is the same as that followed in our
previous tests with white lead (Carlson and Woelfel, Bulletin of the United States
Bureau of Labor Statistics, No. 120, p. 22 et seq.) with the exception of feeding experi­
ments on animals. The gastric juice was obtained from Mr. V ., our man with the
permanent gastric fistula. The juice was collected while Mr. V. was chewing palat­
able food when hungry. It was therefore the so-called appetite gastric juice, ranging
in free acidity from 0.43 to 0.48 per cent. The collection of the gastric juice was
extended over several days, the different lots being mixed, so that all the tests on the
various ores were made with the same stock of human gastric juice.
Samples of lead sulphide ores were kindly sent us by the Federal Lead Co., of Federal,
111., and by the St. Joseph Lead Co., of Herculaneum, Mo. The Federal Lead Co*
sent one sample from the Federal concentrator at Flat Biver and one sample from the
Desloge concentrator; both samples were pulverized. The ore sample from the St.
Joseph Lead Co., which has its concentrator at Bonne Terre, was not pulverized when
received. According to the statements kindly furnished us by the two companies
these ore samples assayed the following percentages of lead:
Federal Lead Co.:
Per cent of lead.
Sample from the Federal concentrator................................................................. 73.4
Sample from the Desloge concentrator................................................................. 70.1
St. Joseph Lead Co.: Sample of ore from Bonne Terre............................................
72. 0
Parallel tests were run with lead sulphide such as is furnished to chemical labora­
tories. This turned out not to be absolutely pure lead sulphide, however, as the
human gastric juice brought into solution a trace of iron besides the lead. All the ore
samples contained a good deal of iron, some of which was dissolved by the gastric
juice together with the lead. The iron was, of course, not included in figuring the
percentage of the lead sulphide dissolved by the gastric juice.
In order to render the tests directly comparable with the previous tests on white
lead we used the following quantities: Lead sulphide ore, 0.5 g.; human gastric juice,
25 cc.; distilled water, 25 cc. (38° C. (100° F.) for 10 hours).
The results are given in the following table:
TE ST S A S TO S O L U B IL IT Y IN H U M A N G A S TR IC JUICE OF L E A D
F U R N IS H E D B Y V A R IO U S E S T A B L IS H M E N T S .

S U L P H ID E OR E

[Solvent used, 25 cc. human gastric juice and 25 cc. distilled water at 38° C. (100° F .) for 10 hours.]

I1-Federal concentrator................................ <2..
1.3..
[1 ..
Desloge concentrator................................ < 2 ..
1.3 .
f 1-St. Joseph Lead C o ................................... <2..
•

(3 . .

(1..
Laboratory lead sulphide........................ <2..
13. .

A m ount
of lead
sulphide
ore used for
digestion.

Lead
contained
in ore.

Lead
sulphate
derived
from
digestion.

Lead
contained
in lead
sulphate.

Gram.

Gram.

Gram.

Gram.

0.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5

0.367
.367
.367
.350
.350
.350
.360
.360
.360
1.433
.433
.433

0.0164
.0156
.0158
.0072
.0076
.0066
.0172
.0178
.0176
.027
.029
.032

Average
percentage
o f lead
dissolved.

0.0111
.0106
.0107
.0049
.0051
.0045
.0117

.0121
.0120
.0185
.0197
.0218

1 Calculated on the basis of the material being pure lead sulphide, containing 86.5 per cent lead.




2.94
1.38
3 .3 2

4.60

84

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

Pure lead sulphide and the dust of lead sulphide ores are soluble in human gastric
juice at body temperature. Lead sulphide ore dust is therefore soluble in the human
stomach, somewhat less so than basic lead sulphate, very much less so than basic lead
carbonate. In our tests with the sulphate and the carbonate, using the same quantity
of gastric juice, the solubility of the lead sulphate amounted to 9.5 per cent; that of
the carbonate to 46 per cent. The table shows that the solubility of lead sulphide ore
averages about 2.5 per cent, while the solubility of laboratory lead sulphide is higher.
We can not account for the distinctly lower solubility of the ore dust from the Desloge
concentrator.
SUM M ARY.

1. Lead sulphide is soluble in human, gastric juice.
2. The solubility of lead sulphide is less than that of basic lead sulphate or basic
lead carbonate, but the sulphide is sufficiently soluble to be dangerous to the health
of persons engaged in mining and milling lead sulphide ore, if the mining and milling
processes involve the production of dust.
3. The persons engaged in mining and milling lead sulphide ore should therefore
be protected in the same way as workers in other dangerous lead industries.




APPENDIX II.
Since this investigation was undertaken the following regulations have been
adopted in New Jersey. Practically all the precautions adopted abroad are recom­
mended, but there is no attempt to forbid the employment of workers in the more
dangerous processes for more than a strictly limited number of hours per day.
REGULATIONS FOR THE LEAD AND COPPER INDUSTRIES.
Drafted b y L i l l i a n E r s k i n e , special investigator for the N ew Jersey Department of Labor, approved b y
E rnst F. E

u r ic h

, consu lting m etallurgical ex pert for the S tate, and issu ed in the form of a circular

letter to these trades b y L e w is T. B r y a n t , commissioner of labor.

The lead and copper industries of the State having been reported upon by our
consulting metallurgical expert and special investigator, I desire to call the attention
of your company to the sanitary regulations governing these trades which are approved
by the department of labor.
I. In view of the dust generated in the handling, sampling, and transportation of
ores, the department requires that care be exercised to protect the workers by means
of a thorough sprinkling of such ores when practicable; that automatic machine sam­
pling shall be the standard method; that the air of the sampling mill or mills shall be
kept free from dust, either by means of sprinkling or efficient mechanical exhaust
ventilation; that if no means can be devised to control the dust generated in empty­
ing sacks containing lead ores, the workers engaged in such operation shall be furnished
and required to wear an approved type of respirator; that no sacks in which lead or
other ores have been shipped shall be cleaned by hand, but that all such sacks shall
be cleaned by sanitary mechanical methods; and that all ores containing lead stored
in bins shall be dampened before transportation.
II. As the roasting of lead ores, whether in furnaces or in sintering machines, or by
any other method, may expose the workers to injurious fumes or gases, the department
requires that when such danger exists, the points at which such fumes or gases enter
the workrooms shall be properly hooded, and the hoods connected with efficient
mechanical exhaust ventilation.
III. The making up of charges for the lead-blasting furnaces being recognized as
offering special risk to the health of workers engaged therein, the department requires
the thorough sprinkling of all materials handled in such charges, to the end that they
may be damp when dumped upon the feed floor.
IV. In view of the fact that in the event of the breakdown or repair of any mechan­
ical exhaust system for the control of fumes generated in the various tapping operations
of the blast furnaces treating lead ores or leady copper ores the workers on the feed
floor mil be exposed to risk if the floor is not tight the department requires that such
feed floors shall be impervious to fume.
Y. As dangerous fumes are generated in the tapping operations of lead-blast furnaces,
the department requires the installation of hoods with efficient mechanical exhaust
ventilation at all points where, in the tapping operations, fumes are liberated.
VI. To prevent fumes and gases issuing from the charging openings of lead and
copper blast furnaces, the department requires flues of a sufficient size, with an
efficient natural or mechanical draft, and suitable provision for any accidental blocking
which may occur, e .g ., providing each furnace with a separate stack communicating
directly with the air and closed with a damper.
VII. (a) In view of the unsanitary features of hand shaking of bags in the bag
house or houses designed for collecting flue dust in lead and copper processes, the




85

86

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

department requires the installation of such mechanical method for shaking as shall
prevent the exposure of the workers to dusts generated in shaking the bags.
( b) The department further requires the protection of such workers as are exposed
to dust in cleaning flues, bag houses, and bag-house cellars by means of the use of special
clothing and approved respirators to be furnished them by the employer for such
purpose; and urges the enforcement by the employer of rules calling for special sani­
tary precautions on the part of the workers employed.
(c) As the cleaning of flues, bag house, and bag-house cellars is universally recog­
nized as an employment hazardous to health, the department calls the attention of
employers to the foreign practice of shortening the hours of such workers as are directly
exposed to flue dust in cleaning processes.
Y III. If in any of the various operations connected with lead refining, lead fumes
habitually, or from time to time, pass into the air of the workrooms, they shall be
removed by means of efficient mechanical exhaust ventilation.
This applies especially to retort furnaces, cupelling furnaces, antimony slag fur­
naces and lead reverberatory furnaces.
IX . In view of the fact that some copper matte contains lead, arsenic, and antimony,
and that in converting copper matte there is always a copious evolution of sulphurous
acid gas, the department requires the efficient hooding of all converters, and that such
hoods shall effectively remove the fumes and gases generated, whatever may be the
position of the converter.
X . (a) To protect the health of the workers, the department requires that the elec­
trolytic tanks be placed in spacious, well-ventilated buildings, and, where necessary,
that fresh air shall be continually supplied by means of fans.
(6) The department requires that all liberating tanks shall be so protected that the
gas bubbles rising to the surface shall not spray the acid solution into the air of the tank
rooms.
(c) The department requires that the purifying of the foul electrolytic solutions,
and the precipitation of copper from the solutions by means of iron, shall either be
carried on in tanks placed under a hood or hoods connected with effective mechanical
exhaust ventilation, or that such tanks shall be placed in the open air in such position
that the gases given off will be quickly diffused and not be a source of harm.
X I . The department suggests the adoption of air rabbling of the copper refining
furnaces, as hand rabbling exposes the worker to excessive heat and glare.
X II. The department urges the elimination of hand charging of the anode and
cathode furnaces, to the end that the prevailing mechanical injuries to the workers
may be lessened.
X III. In order that the air of the workrooms in which furnace processes are carried
on may be kept free from dust, the department requires that skimmings, drosses,
matte, and slag from furnaces shall not be allowed to accumulate on the floors of the
workrooms; that all such by-products as produce dust shall be thoroughly sprinkled
before transportation; and that no dry sweepings but only wet cleaning shall be per­
mitted in the departments where lead is treated.
X IV . Because of the production of lead oxides, and the possible evolution of lead
fumes in the melting of pig lead for trade purposes, or in the manufacture of lead
alloys not containing arsenic, the department requires the protection of all such lead
melting and alloy kettles by means of hoods connected with an efficient method of
ventilation.
X V . In view of the dangerous character of the fumes liberated in the making of
alloys of lead and arsenic, and of the lead oxides and fumes produced in the melting
of scrap lead, the department requires the protection of all such lead and arsenic alloy
kettles and scrap lead melting kettles by means of hoods connected with efficient
mechanical exhaust ventilation.




LEAD POISONING IN SMELTING AND REFINING LEAD.

87

X V I. In view of the established fact that cleanliness on the part of the workers is
an important factor in lessening lead poisoning in all processes in which that metal is
handled, and that copper sulphate, to a greater or less degree, gets on the clothes and
on the persons of workers in the electrolytic refining of copper, and that all employees
in furnace processes and the handling of molten metals are exposed to excessive heat
at certain times, the department requires the furnishing of sanitary lockers, dressing
room or rooms, and convenient and adequate washing facilities, with shower baths for
all lead and copper employees, and urges upon the management the necessity for a
strict enforcement of the use of these washing facilities by the workers.
X V II. Since it is recognized that eating in workrooms contaminated by lead dust
or fumes is a menace to the health of the worker, and that the general eating in rooms
where metallurgical processes are carried on may, in many cases, be very questionable
from a sanitary point of view, the department requires the installation of a sanitary
and convenient lunch room, or rooms for the use of all lead and copper employees,
and urges upon the management the necessity for a strict enforcement of their use.
The efficient mechanical exhaust ventilation required is fixed by the State’s stand­
ard of 1912.
Sufficient suction head shall be maintained in each branch pipe within 15 inches
of the hoods to raise 2 inches of water column in a U-shaped tube. Pressure to be
taken by pressing tube attachment over small opening through pipe, commonly called
static method. Tests to be made with all branches open and unobstructed.




APPENDIX III.

GERMAN REGULATIONS FOR LEAD-SMELTING
W ORKS (JUNE 16, 1905)-1
GENERAL REGULATIONS.

1. Workrooms in which lead ores are roasted, sintered, or smelted, pig lead pro­
duced and submitted to further treatment, distillation of rich lead (bullion cupellation) litharge, red lead, or other oxides of lead prepared, ground, or sieved, stored, or
packed, or zinc skimmings distilled shall be roomy, high, and so arranged that a.
sufficient constant exchange of air takes place. They shall be provided with a level
and solid floor to allow of easy removal of dust by a moist method.
The walls shall be smooth, so as to prevent collection of dust; they shall be either
washed down or limewashed at least once a year.
Provided , That this shall not apply in the case of calcining sheds with wooden walls.
2. An abundant supply of good drinking water, protected against contamination
from dust, shall be provided for the workers on the furnaces and smelting pots, and
in such close proximity to them that they can obtain it at any time without having
to go into the open air.
Arrangements for sprinkling the floors shall be provided near the furnaces. The
floors of the rooms mentioned in paragraph 1 shall be wet cleansed at least once daily.
3. Prepared (i. e., concentrated) lead ores and leady smelting products, unless
moist, shall not be crushed except in an apparatus so arranged as to prevent as far
as possible penetration of dust into workrooms.
Provided , That this shall not apply to calcined material from converters.
Sacks in which lead ores and materials containing lead have been packed shall
not be freed from dust and cleaned except in a dust-proof apparatus or by washing.
4. Materials containing lead for charging the blast furnaces, if they are oxides and
form dust, shall be damped before they are mixed with other materials, stocked on
the feeding floor, or charged into the blast furnaces.
Provided , That this shall not apply in the case of calcined material from converters.
5. Dust, gases, and lead fumes escaping from furnaces and converters, tapping
spouts, tapping pots, drain sump, slag pots, slag cars, or slag channels and from
glowing residues taken from the furnaces shall be caught as near as possible to the
point of origin and removed harmlessly.
Dust-collecting chambers, flues, as well as furnaces which have been “ blown
down” shall not be entered by workmen unless sufficiently cooled and ventilated.
SPECIAL REGULATIONS FOR SUCH PARTS OF A FACTORY WHERE LEAD COLORS ARE
PREPARED.

6. In grinding, sieving, and packing dry leady materials, in charging, and empty­
ing litharge and red-lead furnaces, in collecting the red lead and similar operations
in which leady dust is developed, exhaust arrangements shall be provided for pre­
venting the entrance of dust into the workrooms.
7. Apparatus producing leady dust, if their construction and manner of use does
not effectually prevent evolution of dust, shall have all cracks protected by thick
layers of felt or woolen material, or by similar means, so as to prevent the entrance
of dust into the workrooms.
Apparatus of this character shall be provided with arrangements for preventing
compression of air in them. They shall only be opened when the dust in them shall
have completely settled and they are absolutely cool.
1 From Great Britain, H om e Department. Lead Smelting. Special Report on Dangerous or Injurious
Processes in the Smelting of Materials Containing Lead and in the Manufacture of R ed and Orange Lead
and Flaked Litharge. B y Edgar L . Collis, M. B ., H . M. medical inspector of factories. L ondon, 1910.
p p. 24-27.




LEAD POISONING IN SMELTING AND REFINING LEAD.

89

SPECIAL ARRANGEMENTS IN FORCE FOR THE DISTILLATION OF ZINC SKIM M INGS.

8. Proposed new furnaces for the distillation of zinc skimmings (for which, according
to paragraphs 16 and 25 of the industrial code, a special permission is required) shall
be so arranged that (1) there shall be at least a clear space of 10 feet in front of the
charging opening; (2) any passages under the distillation rooms shall be roomy, at
least 11J feet high in the center, light, and airy.
9. Dust, gases, and fumes arising from the zinc skimmings distillation furnaces
shall be collected as near as possible to the point of origin and cariied outside the
smelting room.
The entrance of gases from the fires into the smelting room shall be prevented as
far as possible by suitable arrangements for drawing them off.
10. Sieving and packing of by-products obtained in the distillation of zinc skim­
mings (poussiere, flue dust) shall not be done except in a special room separated from
the other workrooms and complying with the requirements of regulation 1.
Sieving shall only be done in an apparatus so constructed that dust shall not escape.
EMPLOYMENT OF WORKERS.

11. Women and young persons shall not be employed or permitted in rooms men­
tioned in regulation 1, in flue-dust chambers, or dust flues, or in the removal of flue
dust.
12. No person shall be newly employed in rooms mentioned in regulation 1, in fluedust chambers, or dust flues, or in the transport of flue dust, without a certificate of
fitness from the surgeon appointed by the higher authorities.
These certificates shall be collected and shown to the factory inspector and appointed
surgeon on request.
13. No person shall be employed in charging blast furnaces, apart from mere laboring
work on the floors, for more than eight hours daily. The same shall apply in the case
of workmen employed in the inside of furnaces when cool, or in emptying flue-dust
chambers, or dust flues which contain wret flue dust.
No person shall be employed in cleaning out, from inside, flue-dust chambers,
or dust flues containing dry flue dust for more than four hours daily; and including
emptying and work of transport of this kind altogether no longer than eight hours
daily.
Other workers in rooms specified in regulation 1 shall not work more than 10 hours
in 24, exclusive of mealtimes.
Exception to this is allowed in the case of those workers who are employed for
the purpose of a weekly change of shift, and for whom exception as to Sunday employ­
ment is permitted by imperial decree.
CLOTHING, OVERALLS, LAVATORY ACCOMMODATIONS, ETC.

14. The occupier shall provide for all persons employed in cleaning out flue-dust
chambers, dust flues, repairing of cooled furnaces, grinding, sieving, and packing of
litharge, red lead, or other lead colors, complete suits of working clothes, including
caps and respirators.
15. Work with lead salts in solution shall not be done except by workers who either
grease their hands or are provided with impermeable gloves.
16. The suits of clothes, or overalls, provided in regulations 14 and 15, respirators
and gloves, shall be provided in sufficient amount and in proper condition. The
occupier shall see that they are always suitable for their purpose, and are not worn
except by those workers for whom they are intended; and that they, at stated inter­
vals (the overalls at least once a week, the respirators and gloves prior to use), are
cleaned, and during the time that they are not in use are kept in a place specially
reserved for each article.




90

BULLETIN OF THE BUEEAU OF LABOR STATISTICS.

17. A lavatory and cloakroom shall be provided for the use of the workmen in a
part of the building free from dust. Separate from it there shall be a dining room.
These rooms must be kept free from dust and be warmed during the winter.
In a suitable place provision shall be made for warming the workers’ food.
Water, soap, and towels, and arrangements for keeping separate the overalls from
other clothing taken off before the commencement of work shall be provided in
sufficient amount in the lavatory and cloakroom.
The occupier shall afford opportunity for persons engaged in cleaning out flue-dust
chambers, dust flues, and the cooled furnaces, to take a bath daily after the end of
the work, and for those handling oxides of lead, at least once a week, during working
hours, inside the works. The bathroom shall be warmed during the winter.
18. The occupier shall place the supervision of the health of the workers in the
hands of a surgeon, appointed by the higher authorities for this purpose, whose name
shall be sent to the inspector of factories. The surgeon shall examine the workers
at least once a month in the factory, with a view to the detection of symptoms of
lead poisoning.
The occupier shall not employ persons suspected by the surgeon of having contracted
lead poisoning in the processes mentioned in regulation 1 or in cleaning out fluedust chambers, dust flues, cr furnaces when cold, or transport of the flue dust, until
they are quite well. Those who appear peculiarly susceptible shall be permanently
suspended from working in these processes.
19. The health register shall be shown to the factory inspector and appointed sur­
geon on demand. (Similar to regulation 15 of spelter regulations (Appendix I)
with an addition.)
20. The occupier shall require the workers to subscribe to the following conditions:
(1) Food must not be taken into the workrooms. Meals may only be taken outside
the workrooms.
(2) Workmen must only enter the meal room to take their meals or leave the factory,
after they have taken off their overalls and carefully washed their faces and hands.
(3) Workmen must use the overalls, respirators, and gloves in those workrooms and
for the particular processes for which they are given them.
(4) Cigar and cigarette smoking during work is forbidden.
(5) A bath in the factory must be taken every day at the close of their work by those
engaged in the emptying and cleaning of flue dust chambers, flues, and furnaces when
cold, and by those employed on oxides of lead once a week: Provided , That this shall
not apply in the case of workmen exempted by the appointed surgeon.
Workers contravening these orders will be liable to dismissal without further notice.
21. In every workroom, as well as in the cloakroom and meal room, there shall be
posted up by the occupier, in a conspicuous place and in clear characters, a notice of
these regulations.
The occupier is responsible for seeing that the requirement of regulation 20 (1) is
obeyed. He shall make a manager or foreman responsible for the precise carrying
out of regulation 20 (1), (2), and (5). The person thus made responsible shall see to
the carrying out of the regulations and for the exercise of necessary care as prescribed
in paragraph 151 of the factory act.
22. No work in a lead-smelting works shall be commenced until notice of its erec­
tion has been sent to the factory inspector. After receipt of the notice he shall per­
sonally visit to see whether the arrangements are in accordance with the regulations.
23. These regulations came into force on January 1, 1906.
Where structural alterations are necessary for the carrying out of regulations 1, 5 (1),
6, 9, 10, and 17 the higher authorities may allow an extension of time to a date not
later than January 1, 1908.
If it seems necessary on strong grounds of public interest, the council (Bundesrath)
may extend the time in particular works until January 1, 1913, and until then allow
exceptions from the regulations as regards regulation 13 (1) and (2).




APPENDIX IV.— FRENCH REGULATIONS RELATING TO PRE­
CAUTIONS AGAINST INDUSTRIAL LEAD POISONING.
DECREE OF THE PRESIDENT OF THE FRENCH REPUBLIC (APRIL 23, 1908) RELATING
TO CERTAIN INDUSTRIES IN W HICH LEAD IS USED.
[Translated from Journal Officiel de la Republique Francaise, 29 A vril, 1908.]

1. In the lead industries hereinafter mentioned, viz, smelting, cupellation of argen­
tiferous lead, manufacture of accumulators, glass making, manufacture and use of
lead enamels, manufacture of pottery, decoration of porcelain or faience, ceramic
chromolithography, manufacture of lead alloys, oxides, salts, and colors, employers,
directors, or managers are required, apart from the general measures prescribed by
the decree of November 29,1904, to take special measures for protection and health as
set forth in the following sections:
2. Lead melting pots shall be erected in an airy place separated from the other
workrooms. Hoods or other means for the effectual removal of fumes shall be pro­
vided—
(a) Over the openings for the run of lead and slag in lead smelting;
(b) Before the furnace doors in the manufacture of lead oxides; and
(c) Above the pots for melting lead and its alloys in the other industries enumerated
in section 1.
3. All work with oxides and other compounds of lead capable of producing dust
shall be done as far as possible when in a damp condition.
When this work can not be done in the presence of water or other liquid, it shall
be carried out by mechanical means in covered air-tight apparatus.
If it is impossible to conform to the requirements of either of the first two paragraphs
of this section, the work shall be done under a strong draft so arranged that the
harmful products may be intercepted by apparatus suitably placed.
Finally, if none of these systems is possible the workmen shall be supplied with
respirators.
4. Oxides and other compounds of lead, whether dry or damp, in suspension or
solution, shall not be handled with the bare hand. The employer shall at his own
expense provide the workers in these operations with either gloves made of impervious
material, such as india rubber, or suitable appliances, and shall cause them to be kept
in good repair and frequently cleaned.
5. Tables on which these products are handled shall be covered with some imper­
vious material, kept in a perfectly water-tight condition.
The same requirement applies to the floors of the workrooms, which shall also be
kept damp.
The floor shall be slightly sloped toward a water-tight receptacle for collecting the
lead substances which are washed down.
The work shall be so arranged that there shall be no splashing. The tables, floors,
and walls shall be washed at least once a week.
6. Without prejudice to the requirements of section 3, the grinding and mixing of
lead products, and the use of them in dusting shall be effected in special places with
active ventilation.
If the materials can not be damped, the workers shall be provided with respirators.
i From Great Britain Hom e Department. Lead Smelting. Special Report on Dangerous or Injurious
Processes in the Smelting of Materials Containing Lead and in the Manufacture of R ed and Orange Lead and
Flaked Litharge. B y Edgar L . Coljis, M. B H . M. medical inspector of factories. London, 1910, pp. 27-29.




91

92

BULLETIN OF THE BUREAU OF LABOR STATISTICS.

7. Pottery shall not be dipped with bare hands in solutions containing litharge, red
lead, galena, or white lead in suspension.
8. No food or drink shall be brought into the works.
9. Employers shall, at their own expense, provide and maintain for the use of the
workers, overalls or clothing for use during work only, in addition to gloves and
respirators.
10. In a part of the building separated from the workrooms, there shall be provided
for the use of the workers exposed to lead dust or fumes, a cloakroom and lavatory kept
in good order, provided with basins or taps in sufficient number, a plentiful supply
of water, soap, and a towel for each worker replaced at least once a week.
The cloakrooms shall be provided with cupboards or drawers with locks or padlocks,
the ordinary clothing being kept apart from the working clothes.
11. A warm bath or shower bath shall be provided each week for the workers exposed
to lead dust or fumes.
A warm bath or shower bath shall be provided every day after work for each worker
employed, either in emptying or cleaning the condensing chambers and flues, or in
repairing furnaces in lead works, or in carrying lead corrosions from the beds in whitelead factories, or in packing red lead, or in grinding lead enamels and in dry dusting.
12. Employers are required to exhibit, in a conspicuous position in the works,
regulations imposing on the workers the following obligations:
To use the appliances, gloves, respirators, and working clothes placed at their
disposal.
Not to bring into the works either food or drink.
To pay great care, before each meal, to the cleanliness of the mouth, nose, and hands.
To take the baths weekly or daily as provided in section 11.
13. The minister of labor may, by order made with the advice of the consultative
committee for arts and manufactures, exempt an establishment for a specified period,
from all or part of the requirements of regulations 2 (a), 2 (6), 2 (c), 5 (2), and 6 (1) in
any case where it is found that observance of these requirements is practically impos­
sible, and that the health and safety of the workers are assured by conditions at least
equivalent to those prescribed in the present order.
14. Subject to additional postponements which may be granted by the minister
in pursuance of section 6 of the act of June 12, 1893 (as amended by that of July 11,
1903), the delay required for the carrying out of the alterations necessitated by the
present decree is limited to one year from the date of its publication.
15. The ministry of labor is charged with the administration of this decree.
RECOMMENDATIONS FOR SMELTING MATERIALS CONTAINING LEAD, BY M . BOULIN,*
INSPECTEUR DIVISIONNAIRE DU TRAVAIL, LILLE.

1. Ore moved from the store heap to the furnaces shall be moistened to prevent
the formation of dust while it is being moved and when the furnaces are being charged.
2. If it is proved that at any time the draft of the furnace is not adequate, or if
air taken from close to one of the working doors shows the presence of lead in form of
vapor, or of dust, a competent authority shall have the right to call for erection of
hoods or for some other form of efficient ventilation.
3. Calcining furnaces shall be discharged in such manner that no dust or vapor can
gain access to the workroom.
4. Breaking up of ore, whether slagged or not, shall be preceded by damping, or be
carried on in a closed apparatus, or under conditions which do not expose the men to
inhalation of dust.
5. The charges for the furnaces shallabe prepared in a separate large airy place.
The mixing of the materials composing these charges shall be carried out so that the




1 Bulletin de l ’lnspection du Travail, Paris, 190G.

LEAD POISONING IN SMELTING AND REFINING LEAD.

93

atmosphere breathed by the workmen shall not contain dust. The workmen shall,
moreover, have at their disposal respirators which shall be kept scrupulously clean.
6. The charges shall be brought ready prepared to the mouth of the blast furnaces,
and the charging of the furnaces shall be done as automatically as possible.
7. The receptacles for the slag from the blast furnaces shall be so arranged that the
fumes which are given off during the run shall be immediately carried outside the
workroom.
8. In works where they still use the furnace known as “ bas-foyer Americain,” the
American low hearth, the draft caused by the outside hood shall be so active that
no fume can escape into the workroom. The competent authority shall have the right
to compel this draft to be produced by means of a mechanical fan.
9. When the lead is run, whether this running takes place at the reverberatory fur­
nace or elsewhere, and during the whole time that the metal remains liquid, there
shall be over the vessel containing the lead a hood with a good draft.
10. During cupelling, fumes shall not escape by the furnace door. If they do
escape they shall be completely caught up and drawn away by a ventilating fan.
11. Repairs in the nature of pulling down or rebuilding furnaces shall only take
place after complete cooling, and after damping to prevent the formation of dust.
12. The removal of dross, of litharge, and of the different oxides drawn out of the
furnaces, crucibles, or melting pots shall be so carried out as to prevent the formation
of dust.
13. The floors of the rooms in lead-smelting works shall be of paving stone, of metal,
or of concrete, etc., and shall be made so that it can be washed or at any rate damped
out of the usual work hours.
14. The walls and ceilings, as well as the woodwork supporting the roof, if there is
no ceiling, shall have a surface which can be efficiently washed, or they shall be limewashed at least once a year.
15. Workrooms not situated in the open air shall always be well lighted and
ventilated.
16. The walls shall be as smooth as possible, and every precaution taken to prevent
dust from accumulating.
17. The tools and implements used to work the ore, the oxides, etc., shall be cleaned
as often as possible, and always before being sent to the repair shops.
18. No food or drink shall be kept or consumed in the workrooms.
19. Employers shall provide for the use of their workpeople a suitable dining room.
This room shall contain a table, benches, and apparatus for warming food, and a set of
numbered pigeonholes with locks, where each man can place his food. The room shall
be warmed, lighted, and properly kept up by the employer.
20. No alcohol, or drink containing more than 10 per cent alcohol, shall be brought
into the works.
No smoking, snuff taking, or chewing tobacco shall be allowed in the workshops.
21. In every works there shall be lavatories of sufficient number, and conveniently
placed, so that the men may have no difficulty, and the least possible loss of time, in
using them. These lavatories shall be provided with the necessaries for washing the
body, hands, and nails.
22. The employers shall provide for the use of the workmen a room with shower
baths, where there shall be warm water, soap, and towels. They shall make arrange­
ments for every man to have a shower bath at least once a week. The constituted
authority may order, for the whole of the workpeople, or for the men in certain work­
shops, more frequent shower baths.
23. In every works there shall be a room provided with one or more baths according
to the size of the staff, and with everything necessary for the men to take a complete
bath if they wish to or on the surgeon’s order.




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BULLETIN OF TH E BUREAU OF LABOR STATISTICS.

24. The employers shall provide for the use of the workmen working clothes, and
shall see that they are used. These clothes shall be cleaned at least once a week and
not be shaken.
25. No women or children shall be employed in workshops where lead is smelted
or manipulated.
26. The employers shall provide for the use of their workmen a cloakroom, so arranged
that each man can place his clothes under lock and key. No part of their ordinary
costume shall be laid down in the workshops, nor elsewhere than in the cloakroom.
27. Every man wishing to be employed in a lead-smelting works shall produce a
medical certificate stating that he has no physical defect rendering him specially
liable to suffer from the influence of lead.
28. In every works a surgeon shall be appointed to examine, at least once a month,
every man on the premises. The results of his visit shall be noted down in a register,
which may be examined at the office of the works by the authority appointed to in­
spect the factory.
29. Any man who does not conform to the regulations which concern him, and who
becomes the victim of plumbism, may be discharged, moved from his workshop, or
suspended according to the regulations or custom, without having a right to any
compensation other than that which is provided (or may be provided) by the law or
assurance in case of illness.
30. Every case of plumbism, causing suspension from work for at least 48 hours,
shall be notified to the mayoralty, without delay, by the employer or his representa­
tive. Receipt for this notification shall be given by the mayor and kept in the
register appointed by regulation 28.
31. A notice drawn up in a simple form, and within the understanding of any one,
pointing out the causes of plumbism, the means of preventing it, or of curing it, shall
be put up in the dining room of the works. The wording shall be the same as the
present order.
32. A man employed in lead-smelting workshops shall not be employed continu­
ously more than 8 hours in 24 hours or more than 12 hours in 36 hours. He shall be
given from the former an interval of at least half an hour; from the latter of one hour
to eat food brought to the works.
33. Gases and fumes returned to the atmosphere shall only contain traces of lead.
34. The cleaning of the flues and the condensation chambers shall be done by
porters in special light costume and in respirators. These men shall take a v/arm
shower bath after every spell of work. No spell may be longer than four hours.




APPENDIX V .— PROVISIONS FOR MEDICAL INSPECTION AND
CARE IN ENGLISH, GERM AN, AND FRENCH SMELTERS.
A. GREAT BRITAIN.

Regulations, dated August 12, 1911, made by the secretary of state for the home
department, for the smelting of materials containing lead, the manufacture of red
or orange lead, and the manufacture of flaked litharge.
13. (a) Every person employed in a lead process shall be examined by the surgeon
once in every calendar month (or at such shorter or longer intervals as may be pre­
scribed in writing by the chief inspector of factories) on a date of which due notice
shall be given.
(b) A health register containing the names of all persons employed in any lead
process shall be kept in a form approved by the chief inspector of factories.
(c) No person after suspension shall be employed in any lead process without writ­
ten sanction from the surgeon, entered in the health register.
17. Every person employed in any lead process shall present himself at the ap­
pointed time for examination by the surgeon in pursuance of regulation 13 (a).
18. No person employed shall, after suspension under these regulations or under
any other regulations or special rules applying to factories or workshops where any
process involving the use of lead is carried on, work in any lead process without
written sanction from the surgeon, entered in the health register.
B. GERMANY.

German regulations for spelter works 1 (16th February, 1901).2
14. The occupier shall place the supervision of the health of the workers under the
care of an approved surgeon, whose name shall be given to the factory inspector.
The surgeon shall examine workers at least once a month and pay special attention to
signs of plumbism.
On the report of the surgeon, workers who show signs of injury to health from em­
ployment, i. e., signs of plumbism, shall be suspended until complete recovery, and
such as show special susceptibility shall be suspended permanently from employment
in the distillation rooms, in operations mentioned in regulation 8 and on work con­
nected with removal of residues.
15. The employer shall keep a book, or have it kept by one of the works officials, to
register the changes and number of his workmen, as well as their condition of health.
He is responsible for the completeness and accuracy of the entries, in so far as they
are not made by the surgeon. This register shall contain:
(1) The name of the man by whom the register is kept.
(2) The name of the doctor responsible for the supervision of the workmen’s state of
health.
(3) Christian and surname, age, domicile, and the date of entering and leaving of
each workman, as well as the nature of his employment.
1 These regulations were adopted for lead smelters a,Iso; see p . 88.
2 From Great Britain H om e Department. Lead Smelting. Special Report on Dangerous or Injurious
P r o c e s s e s in the Smelting of Materials Containing Lead and in the Manufacture of R ed and Orange Lead
and Flaked Litharge. B y Edgar L . Collis, M. B ., H . M. medical inspector of factories. London, 1910.
P p . 23 , 24.




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BULLETIN OF THE BUREAU OF LABOK STATISTICS.

(4) The date and the nature of the sickness of a workman.
(5) Date of recovery.
(6) Date and results of the general medical examination as specified in regula­
tion 14.
16. The occupier shall require the workers to subscribe to the following conditions:
(1) Food must not be taken into the workrooms. Meals may only be taken outside
the workrooms.
(2) Workmen must only enter the meal room to take their meals or leave the factory,
after having carefully washed face and hands.
17. In every workroom, as well as in the cloakroom and meal room, a notice of the
preceding regulations shall be posted up by the occupier in a conspicuous place.
The occupier is responsible for seeing that the requirement of regulation 16 (1) is
obeyed. He shall make a manager or foreman responsible for the precise carrying out
of regulation 16 (1), (2), and (5).1 The person thus made responsible shall see to the
carrying out of the regulations and to the exercise of necessary care, as prescribed in
paragraph 151 of the factory act.
C. FRANCE.

French regulations (mesures d1ordre general), drawn up by the commission of indus­
trial hygiene, for industries in which there is danger of lead poisoning.2
8. Medical supervision of the staff employed in the factories specified in regulation
1 shall be made by a surgeon paid by the employer and chosen by him from a list
prepared every year. The name of this surgeon shall be notified every year to the
inspector of factories by the employer during the month of January.
The minister of commerce, after consulting with the commission of the factory
department and the commission of industrial hygiene, when he has heard the inter­
ested parties, need not ratify this choice.
A periodical inspection of the staff shall take place every month; further, every
workman who feels ill shall be seen or visited by the appointed surgeon. This sur­
geon shall inform the employer and the workman whenever he recognizes a case of
plumbism.
The employer shall immediately send to the inspector of factories an extract of
the register, indorsed according to the next regulation, relative to the case which has
been notified to him.
Workpeople who present symptoms of plumbism shall be removed from work places
named in regulation 1. They may only be readmitted on producing a medical cer­
tificate stating their fitness for the work; but they may meanwhile be employed in
other parts of the factory.
9. The employer shall be responsible for a register containing the following details:
(1) Name, Christian name, age, address, date of commencement and of leaving of
each worker, as well as the nature of his work;
(2) The nature, the date of onset, and termination of every attack of plumbism
which causes incapacity from work or necessitates a change of employment (by appli­
cation of the twelfth line of the preceding regulation);
(3) The date and general conclusions of each of the regular medical inspections and
instructions with regard to- sections 2 and 3 shall be written in the register by the
surgeon himself.
1 See No. 20, p. 90.
2 From Great Britain Home Department. Lead Smelting. Special Report on Dangerous or Injurious
Processes in the Smelting of Materials Containing Lead and in the Manufacture of R ed and Orange Lead
and Flaked Litharge. B y Edgar L. Collis, M. B ., H . M. medical inspector of factories. London, 1910,
p. 27.




LEAD POISONING IN SMELTING AND REFINING LEAD.

97

10. The employers, etc., shall exhibit this decree bo that it can be easily seen from
the place where the men are engaged and paid. They shall also fix in the same place
a workshop regulation imposing the following obligations upon the hands:
(1) To use the tools and the means of protection placed at their disposal to prevent
contact of the bare hands with lead compounds;
(2) Not to walk with bare feet in the shops;
(3) To use the overalls placed at their disposal for work and to return them to their
proper place;
(4) To be clean, and specially to rinse out the mouth after every spell of work;
(5) To take regularly every month a sulphur bath;
(6) Not to smoke, take snuff, or chew tobacco; not to bring or consume any food
or any beverage within the work places specified;
(7) To present themselves at the regular monthly visits.
The workshop regulations must state the name and address of the surgeon appointed
to undertake the medical supervision of the staff, and also state the places, days, and
hours that he will examine sick workmen apart from the regular visits.
10A. Every man employed in the specified places shall receive a copy of instruc­
tions stating the dangers of lead poisoning and the means necessary to avoid it.
The text of these instructions is fixed by ministerial order under the advice of the
commission of industrial hygiene of the minister of commerce.
11. The minister of commerce may, by decree issued on the report of the factory
inspectors and after consulting the committee of arts and manufactures and the com­
mittee of industrial hygiene, exempt a factory permanently or provisionally from
observing regulation 3 (1) and regulation 5 (1) when it is recognized that the practical
observance of these regulations is impossible in the factories under consideration
and that the health of the workmen is assured by conditions at least equivalent to
those fixed by the present decree.

31080°—Bull. 141— 14------ 7