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FEBRUARY 19 56

business review

I

■

FEDERAL RESERVE
BANK OF
PHILADELPHIA




THE HEAT PUMP
The heat pump is a climate machine that automatically makes
your house a comfortable home through all kinds of weather.
Using only electricity and air or water, it warms your house
in winter and cools it in summer. It's safe, clean, and reliable.
Yet to come is mass production needed to cut the cost
and widen theimarket.

THIRD DISTRICT BANKING— 1955
Record increase in bank loans partly offset by reduction in investments.
Current earnings higher, but net profits decline.

Additional copies of this issue are available
upon request to the Department of Research,
Federal Reserve Bank of Philadelphia,
Philadelphia 1, Pa.




THE
HEAT
PUMP
A hundred years ago the heat pump was just an

was the electric washer because it was Monday.

idea. Today it is a reality. Within a decade it

In answer to one of the doubting-Thomas type

may be a big industry.

of questions about the heat pump the hostess

The heat pump is a device that pumps heat

said: “ The only complaint I have with the heat

into your house in winter and out of your house

pump is that the home is so comfortable that my

in summer.

It burns no fuel and requires no

weekend guests do not want to go home but want

It uses only electricity and air or

to stay with me all week. I can’t even get them

water. The electrical connections are as simple

out of the house to take a walk on the board­

as those for an electric range or dryer. In size
the heat pump is comparable to the modern od­

walk.”
Deep in January we called upon more resi­

chimney.

or gas-fired furnace and just as sleek. Manufac­

dential heat-pump users to find out how they

tured by the best-known electrical appliance man­

fare in cold weather. All of them were keeping

ufacturers in the country, it can be installed in

warm and all were apparently happy except the

any house— old or new. The heat pump is a

owner who put a thermometer in every room to

climate machine that diffuses perpetual comfort

test the heat-pump salesman’s promise of uniform

throughout the entire house. It is automatic.

heat throughout the house. When one of the
seven rooms was found to be out of line by two

When we first heard about the heat pump we
thought it was one of the latest tales right out of

degrees he squawked.

a science-fiction publication. On further inquiry

Safe, clean, and compact, the heat pump can

we found a number of people already living in

be installed almost anywhere in the house— in

heat-pump luxury in Southern New Jersey. So to

the basement, the utility room,

Jersey we went and called at the homes of a

garage. In cold weather, warm air flows through

number of heat-pump users. Seeing is believing.

metal ducts into every room of the house and the

At the very first call in a home located just a

same ducts also circulate cool air through the

or attached

few minutes’ walk from the beach in a suburb

house in summer.

of Atlantic City the hostess graciously conducted

pump has no use for a furnace, fuel tank, or flue.

us through her new home. It was a warm day in

Neither does it need any other form of air condi­

August.

The doors and windows were kept

tioning. The heat pump is a combination heating

closed.

The heat pump was running, and so




Thus, a house with a heat

and cooling mechanism all in one package.

3

b u sin e ss re v ie w

On

house

little or too much. Strange as it may seem there

equipped with a heat pump is a conventional-

a

centrally

located

wall

of

the

is always some heat in the atmosphere, even

looking thermostat with an unconventional fea­

though it may be so cold that your teeth chatter.

It has two controls instead of one. The

It is only simple logic that air at 32 degrees

“ heat” control is set at 75 degrees if the tem­

Fahrenheit is warmer than air in zero weather.

perature of the house is not to fall below that

The same reasoning tells us that air at zero is

ture.

point; and the “ cool” control may be set at

warmer than air at 50 degrees below zero or even

79 degrees if the temperature is not to go above
that point. You simply set it and forget it.

colder temperatures. All we need is a method
of extracting this heat, and with the new refrig­

Thereafter you are never cold and chilly in

erants available today the heat pump can accom­

winter or hot and sweaty in summer.

plish this task easily. Perhaps the accompanying
illustration helps to clarify how the heat pump

What goes?

works.

The “ works” of a heat pump are much like
those of a refrigerator. In fact, the refrigerator

Heat is where you find it

in your home is a one-way heat pump. It sounds

Heat pumps of the so-called air-to-air type are

crazy but it’s true. It pumps heat out of the food

designed to extract heat from the atmosphere.

compartment into your kitchen. By placing your

The heat so extracted is stepped up by the com­

hand on the outside coil, you can feel the heat

pressor which supplements the heat taken from

being thrown off. If you remove the door of the

the air by the heat equivalent of electricity used

refrigerator and push the open side up against

to run the compressor. Naturally, the lower the

a hole cut in the wall of your house, you have a

outside temperature the harder the heat pump

small-scale heat pump. It would take heat from

must work to warm the house. Heat pumps come

the atmosphere outside and warm your house.

with built-in electric resistance units to supply

On reversing the position of the refrigerator so

additional heat and defrosting required in areas

that the open side faces indoors, the machine

where the winter temperature occasionally drops
very low.

would cool the house by removing the heat from
the indoor air and rejecting it through the con­

The big advantage of the air-to-air heat pump

denser to the outdoor air. Basically, all that is

is that there is no place without air.

needed to convert a refrigerator into a full-scale

atmosphere is not the only source of heat; there

heat pump is to install a bigger motor, a larger

are also ground-to-air and

pump called a compressor, a thermostat, and a

pumps.

set of valves to reverse the cycle automatically
instead of physically turning the box around.

But the

water-to-air heat

The earth itself is a good source of heat. In
the ground below the frost line is a great reser­

Operating on the principle of a refrigerator,

voir of heat at practically constant temperature.

it is easy enough to see how the heat pump cools

This natural heat sink can be tapped with a

a house in summer; but how in the world does it

ground-to-air heat pump. The way this works

heat in winter?

is to circulate a refrigerant through a system of

Now, heat is a peculiar thing. It is hard to

copper pipes buried four or five feet below the

define; but anybody knows when he has too

surface. The liquid refrigerant circulates through


4


b u sin e ss re v ie w

HOW THE HEAT PUMP W O RKS
SUMMER

C O O L IN G

the underground pipes where it picks up the
ground heat. In so doing the refrigerant changes

W IN T E R

H E A T IN G

water is merely borrowed for a few minutes to
get its heat and then returned.

into a gas which is made still hotter on going

All three types of heat pump are in use today.

through the compressor. Upon entering the con­

The water-to-air pump is, of course, limited to

denser the hot gas gives up its heat to the house

sections of the country where there is an abun­

heating system and in the process reverts to a

dance of good, clean water. Many such pumps

liquid and returns to the ground to pick up more

have been installed in Florida where it is neces­

heat.

sary to dig wells only 15 or 20 feet to get the

So it goes—round and round, and the

process is reversed for cooling.

required water. The ground-to-air type of heat

The water-to-air type of heat pump gets its

pump has some drawbacks; it is costly to buy

heat from a natural body of water such as a

and bury several hundred feet of copper pipe in

river, lake, or well. Well water is an excellent

the first instance and it is expensive to dig up

source of heat which seldom falls below 45 de­

the pipes in case of needed repairs. Much engi­

grees Fahrenheit in this country. The water is

neering talent has gone into improvements on

pumped from a well into a condenser where the

the air-to-air pump, which seems to be in the

refrigerant coil absorbs heat from it to warm

ascendancy. According to a 1955 survey of heat-

the house. The water from which the heat has

pump installations, both residential and commer­

been extracted may be discharged down the

cial, over half were of the air-to-air type and

drain or in areas where water is scarce it may

most of the remainder used water as the source

be returned to an adjacent well so that the water

of heat. In residential installations, the prefer­

table is not affected. In the latter instance, the

ence of air over water as the heat source is more




5

b u sin e ss re v ie w

pronounced
Some

than in commercial installations.

commercial

and

industrial

As improvements and refinements were made

enterprises

throughout the thirties, a limited number of heat-

utilize the waste heat of processing water to

pump installations were made in various places

supply their heat pumps.

throughout the country from Connecticut to Cali­

No matter what the source of heat, all heat

fornia.

During this period of trial and error

pumps are based on a simple law of thermo­

there was a predominance of commercial instal­

dynamics— heat flows from a substance at a

lations. Progress was temporarily retarded dur­

higher temperature to a substance at a lower
temperature, just as water flows from a higher

turers were busy on war work. After the war,

ing World War II, when heat-pump manufac­

to a lower level. Also like water, heat must be

big money went into the improvement of heat

pumped from a lower to a higher level. By in­

pumps for residential use. They now come in

ference, the temperature of Hades is uniform

package units with a choice of horsepower for

throughout for if it were not, some enterprising

different size houses. The leading manufactur­

engineer would install a heat pump and make a

ers, including several blue-chip companies, are

corner of the kingdom comfortable.

busy enlarging production facilities and build­

History of the heat pump
The heat pump is very young so its history is
short. Like many other inventions, the heat pump
had its origin in Europe where it appeared
shortly after World War I. There the early in­
stallations were industrial applications, especially
in certain chemical industries, in paper mills,
and in sugar refineries where compressors were
used to generate heat for drying purposes.
The use of mechanical devices to heat or cool
buildings had to await the arrival of low-cost
electricity. Initial efforts were directed at sum­
mer air conditioning, and unit air conditioners
cooling one room only made their appearance
in the 1920’s. In the early thirties, engineers in
cooperation with electric utilities, began experi­

ing up dealer organizations to bring the heat
pump to the attention of the public.
Precisely how many heat pumps are being
produced or how many are now in use, no one
really knows.

One reason is the comparative

youth of the product which still has no estab­
lished channels to collect reliable statistics, and
another reason is the rapidly growing acceptance
of the product. Prior to 1954 it was a simple
matter to keep track of the relatively few instal­
lations; most of the companies knew where they
were and followed them closely. However, with
the tremendous expansion of sales during the
past two years it was no longer possible to do
this. Such records as there are show that almost
two-thirds of them are in private homes and the

menting with heat pumps for heating and cooling

others in commercial establishments. Of the six

both homes and offices. In this country the first

or eight companies already in the business, the

two heat-pump installations for year-round com­

leading manufacturer is currently reported to be

fort air conditioning were installed in late 1934

turning out heat pumps at the rate of 4,000 units

and early 1935 in the Salem, New Jersey, office

a year. Although some of the estimates of output

of the Atlantic City Electric Company and the

and installations are pardonably optimistic, it

Riverside, California office of the Nevada Cali­

cannot be denied that the market for the heat

fornia Power Company.

pump is getting “ hot.”


6


busii

le w

G eography of the heat pump

stricted to the area below the Mason-Dixon Line.

Most of the heat pumps are in the South. This is

With a great deal more heating capacity built

plainly shown on the accompanying map, based

into the latest models, heat pumps are steadily

on 2,076 installations for which exact locations

expanding their market northward. South Jersey

are known. Florida had the greatest number of

may be cited as an example of how the heat

known installations, followed by California, Ten­

pump moves into and captivates an area. The

nessee, and Texas, in that order. At the time of

electric utility serving that region reported one

the survey there were only nine states without

heat pump on its lines in 1953, eight more in

any heat-pump installations.

1954, and 78 more last year.

Generally speaking, the heat pump is more
attractive and economical in the milder climates

Economics of the heat pump

of

the South, Southwest, and Pacific Coast.

Like all good things, heat pumps cost money.

Florida, for example, has been an excellent

Both the original cost and the upkeep depend

market for the heat pump where it serves as a

upon a number of things— the size of the house,

cooling agent throughout the long hot summers

the type of construction and insulation, the loca­

and it dispels the chill during the comparatively

tion, the prevailing climate, and the cost of

few cold days in winter. Indeed, many homes in
that area have no heating facilities of any kind.

electricity. It also depends upon the size and
type of heat pump installed.

Although the heat pump originally found its

First, let us consider the cost of installation.

best market in the South, it is no longer re-

The installed cost of a heat pump ranges from

HEAT PUMP INSTALLATIONS

$2,700 to $3,100 for a
house in the $15,000 to
$20,000 price class. That
includes not only the heat
pump itself but also the
necessary wiring and duct
work

for

an

air-to-air

type of installation.
In Florida, where watercooled heat pumps pre­
dominate, an installation
for a small home costs
only $1,700 including the

NOTE— Map includes 2,076 installations for which exact locations have been re­
ceived by Joint AEIC-EEI Heat Pump Committee as of May 1955.




well. They cost less down
there because smaller
units with less heating
capacity are adequate for
the short, mild winter and
also because of the ready
supply of water as a source
of heat.

7

b u sin e ss r e v ie w

The cost of a heat pump is obviously much

tricity for all purposes. Of that the heat pump

greater than that of a conventional gas, coal, or

consumed $261.49 of electricity-—$197.73 for

oil heating system; but such a comparison is

heating from October through June and $63.76

invalid.

Since the heat pump furnishes both

for cooling from July through September. The

heating in winter and cooling in summer, its

80-gallon water heater consumed $116.18 of elec­

cost should be compared with the cost of both

tricity, and the remaining $107.66 went for other

a heating and central air-conditioning system.

purposes such as the range, electric clothes

On that basis, the cost of a heat pump is esti­

dryer, lighting, etc. From the description it is

mated to run only 15 to 20 per cent higher.

apparent that the owner has an all-electric home

Users of the heat pump are willing to pay the

in which the cost of operating the heat pump was

added cost for the added comfort and con­
venience.

just slightly over 50 per cent of the total elec­
tric bill.

The heat pump supplies a more steady, even

In the 1954-1955 season, when the winter was

flow of heat instead of periodic blasts. In addi­

considerably colder and the summer was some­

tion to heating when it is cold and cooling when

what kinder, the cost of operating the heat pump

it is hot, the heat pump cleans and filters the air,

was only $203.79— of which $187.88 was for

automatically removes excess moisture from the

heating duty and $15.91 for cooling duty. Nat­

air, and can ventilate the year round. Inciden­

urally, the cost of electricity is an important ele­

tally, in a seashore home with a heat pump the

ment in the cost of operating a heat pump. In

salt shakers always work no matter how humid

the case just cited, where the owner’s total elec­

the weather, and fishing boots never collect mil­

tric bill for the 1954-1955 season was $458.29,

dew. Another feature especially appreciated by

he consumed 24,748 kilowatt hours of electricity.

the housewife is the fact that there is no dust or

That is 1.85 cents per kilowatt hour. At an aver­

smudge inevitably associated with a fuel-burning

age rate of 2 cents a kilowatt hour, his bill would

system. The heat pump feeds on electricity and

have been $494.96 and at an average of 2 x/2 cents

there is nothing so clean as a kilowatt.

it would have been $618.70. So the rate struc­

The cost of operating a heat pump is deter­

ture of the company that supplies your electricity

Generally, the

is one of the first things to consider before in­

farther north or the longer the winter the greater

stalling a heat pump. It has been said that the

the cost of operation. Instead of speaking of an

heat pump operates at a competitive disadvan­

mined largely by the climate.

average cost, which nobody pays or a range of

tage when electricity costs more than 2 cents a

cost which only two people pay, let us take a

kilowatt hour, but that depends on the cost of

specific case from nearby South Jersey.

competitive fuels. What interests the customer

The owner has a two-story residence exposed
on all four sides.

The house, in the $22,000

price class, has about 1,600 square feet of floor

most is the total cost of air conditioning his
house, and this is bound to decrease as heat
pumps are improved in efficiency.

space and is approximately 13,000 cubic feet in
content.

It is equipped with a five horsepower

Future of the heat pump

air-to-air type of heat pump. During the 1953-

“ Cool as a mountain breeze in summer and warm

1954 season the owner spent $485.33 for elec­

as a South Sea island in winter,” says the an­


8


b u sin e ss re v ie w

nouncement of one of the heat-pump manufac­

praising the outlook for the heat pump is the

turers and the copy is illustrated with a scene

attitude of the utilities. Reference here has al­

that looks like lovely Lake Louise in the Cana­
dian Rockies and another that portrays breakers

ready been made to the fact that the sale of heat
pumps is predicated on low-cost electricity.

gently lapping a palm-studded beachfront em­

Moreover, they use a tremendous amount of it.

bellished with tropical cheesecake. The overleaf

When a heat pump is installed the household

is full of figures about B.T.U.’s, belts, horse­

consumption of electricity jumps from an aver­

power, and a blueprint— all of which would de­

age of about 2,500 kilowatt hours a year to ap­

light the heart of an engineer.

proximately 20,000. Should growth of the heat

Advertising has its place, and so does engi­

pump turn out to be anything like that expected

neering, but what is the future of the heat pump?

by their manufacturers, it would give a tremen­

The heat pump is a delight and a joy to the 4,000

dous boost to the sale of electricity.

or 5,000 owners who have them. Manufacturers

One of the most amazing things about our

know they have a good product, and on the

post-war economy is the huge amount of money

basis of rapidly increasing sales they are en­

already spent by the electric utilities to expand

thusiastic about the future.

already been approved by the Veterans Adminis­

their capacity for the generation and distribution
of electric power. Equally amazing is the large

tration and the Federal Housing Administration.

amount of money they have earmarked for future

In the present state of the art, the biggest ob­

expansion. Entering into these expansion plans

stacle is the first cost. The industry today stands
about where the automobile did in 1915. Basic

are devices like the heat pump which feeds solely
on kilowatts and feeds heavily.

Heat pumps have

principles have been mastered, but the cost still
restricts sales to the luxury market.

Many utilities welcome the addition of heat

Yet to come is the mass production needed to

pumps on their lines, not only as an increased
outlet for the sale of kilowatt hours but also to

cut the cost and widen the market. Heat-pump

help balance their load. As a result of the phe­

manufacturers cite the example of the household

nomenal growth of room air conditioners during

refrigerator which in 1920 had an average price

the past few years, the summertime load of the
utility goes very high so that something is

of $600 and decreased over 70 per cent to an
average price of $172 in 14 years as public ac­

needed to bring up the winter load. The heat

ceptance of the product increased and the mass

pump is an ideal instrument for that purpose.

market was developed. In anticipation of a de­

Owing to

crease in the cost of production of 50 per cent or

energy, the peak power requirements must be

the difficulty of

storing electrical

more, simplification of components, increase in

available at all times and it is costly to allow

efficiency, smaller physical dimensions, and more

equipment to stand idle awaiting peak summer

attractive exteriors, manufacturers expect the

requirements. Anything that helps to smooth out

sale of heat pumps to rise to 75,000 units a year

the peaks and valleys in the production of power

by 1960 and 250,000 by 1964. Market acceptance

increases the efficiency of utility operation.

of the heat pump is expected to outstrip any elec­
tric consuming device except television.
Another factor to be reckoned with in ap­




Electric utilities live on the sale of power but
some of them also sell gas. Naturally, those that
sell electricity only are likely to be most en­

9

b u sin e ss r e v ie w

thusiastic about taking heat pumps on their

business proposition. In such cases the heat

lines and some of them offer special heat pump

pump easily pays its cost and keep in greater

rates. Ordinarily, it is the manufacturer that de­

efficiency of output or expanded volume of sales.

signs and builds a new household appliance

By all appearances the heat pump is here to

who gets the utility interested to put the new

stay and it could easily revolutionize residential

device on their lines, but in the case of the heat

and commercial space heating. Its progress is

pump it has been the reverse. Here, the utilities

being scrutinized very carefully by those whose

are pushing the manufacturers of heat pumps.
In appraising the market for heat pumps, em­

fortunes may be affected. Manufacturers of airconditioning equipment are interested because

phasis has been placed upon residential installa­

the heat pump is right up their alley and offers

tions. The producers, however, are not over­
looking the commercial market. Unlike a resi­

double-barreled service. Electric utilities are in­
terested because the heat pump has potentialities

dential heat pump which sells on the basis of

for greatly expanded output of electric power

comfort and convenience, the installation of a

and better balanced loads. Gas and oil com­

commercial heat pump in an office building,
factory, store, or theater is looked upon as a

panies are concerned because the heat pump
may do to them what they did to coal.

THIRD DISTRICT BANKING - 1955
The annals of business for 1955 are sprinkled

heavier

with references to new high points achieved. In

finance companies, utilities, mortgage dealers and

part this is matched by the records of banking

others. Real estate loans moved up considerably

borrowings

by

manufacturers,

sales

becoming available with the filing of year-end

in 1955 and the volume of instalment credit

reports.

granted to consumers expanded rapidly.

Heavy borrowing from the banks was to be

The growth in total bank credit was much less

expected and was very much a part of the bank­

than the increase in loans.

ing picture in 1955.

Preliminary tabulations

drawn down considerably to help meet the per­

covering member banks in the Third Federal

sistent demand for loans. Sales and redemptions

Reserve District show the greatest increase in

reduced holdings of United States Treasury is­

loans ever reported in a twelve-month period, a

sues by $327 million to $2,496 million. And

Investments were

rise of nearly $600 million or 18 per cent to a

investments in other securities, chiefly the obli­

record $3,818 million. Demands came from many

gations of states and local governments, were

sectors of the economy. Reports in detail from a

reduced materially, falling $130 million to $802

group of large banks indicate that a sharp rise

million.

in advances to commerce and industry reflected


10


In percentage, the increase in loans and the

b u sin e ss r e v ie w

MEMBER BANKS— THIRD DISTRICT

To help maintain reserve positions, borrowing

B ILLIO N S

serve Bank was definitely more active than in
1954. Semi-monthly averages show that such

by Third District banks from the Federal Re­
$

borrowings were consistently larger than excess
reserves in the last half of the year. In the clos­
ing month of 1955 the Reserve Bank’s discounts
and advances to member banks averaged over
$60 million daily as against $18 million a year
earlier.
With loans in record volume,, the gross earn­
ings of Third District member banks reached a
new high point.

Preliminary tabulations, ad­

justed for bank mergers, show total income of
$293 million, 8 per cent more than in 1954.
More than half of this increase was absorbed by
rising expenses— salary and wage payments, in­
terest on deposits, and other items of outgo—
but a sufficient amount remained to add ma­
terially to current earnings after expenses.
Consistent with developments during the year,
profits on securities were much smaller than in
1954 and valuation reserves on loans were built
up substantially by transfers out of earnings.
decrease in holdings of Federal Government

These and other changes more than offset higher

securities at member banks in the Third District

net current earnings and a decline in income tax

were in line with member banks throughout the

payments. Accordingly, the preliminary figures

country, judging by figures for the year ended

show a decline of nearly $8 million to $53 million

December 28, 1955. But the decline locally in

in net profits available for distribution.

other securities contrasted with a small increase

dividends increased and absorbed three-fifths of

in the national figures.

net profits.




Cash

11

FO R TH E R E C O R D . . .
BILLIONS *

M EMBER B A N K S 3RD ER.D.
i! POSITS

B A N K IN G

L

J

i _______________________ /

h e ? /
VT K J V
f

/|

”

/

4

W

1

1

^

c iE C K PAYMENTS
0 CITIES^

a

th V E S T M E N T S

3
L

~+
)ANS

2

2 YEARS
AGO

YEAR
AGO

Factory*

SUM M ARY

Third Federal
Reserve District

Un ted States

Per cent change

Per cent change

December
1 9 55 from
mo.
ag o

year
ag o

12
mos.
1955
from
ye ar
ag o

December
1 955 from
year
ag o

mo.
ago

12
mos.
1955
from
year
ag o

LO CAL
CHANGES

0
4
6

+
+
+

EM PLO YM EN T A N D
IN C O M E
Factory employment (T o ta l). .
Factory w a g e incom e.............. +

0
1

+ 3
+12

0
3

+
+

TRADE**
Department store s a le s ............
+
B A N K IN G
( A ll member banks)
Deposits.......................................
Lo an s............................................
Investments..................................
U .S. G ovt, securities..............
O t h e r .........................................
C h e ck payments........................

7
9
7

7
8

+ 3
+12
+12

+

0
7

+

7

+
+
+
+

2
2
1
1
0
+12t

+ 1
+18
-1 2
-1 2
-1 4
Of

ot -

’ Based on 3-month moving averages.
’ ’ Adjusted for seasonal variation.

12




-

+ 1 1

+16
+21

+21
+19

-

1

+

6

+

4

+
+

5
8

+

7

+

0
3

1t

ot

0
0

f2 0 C itie s
^Philadelphia

+ 3
+17
-1 0
-1 2
0
+ 8
+

2
0

+ 4
+13
- 1
- 3
+ 8
+ 8
0
0

Sales

Stocks

year mo. year mo. ye ar mo. year mo.
ag o ag o ago ag o a g o ago ago ag o

A lle n to w n . .

0

FHarrisburg . . .

0 +14

Lancaster. . .
P h ila d e lp h ia .

+ 3 + 2
+13
+ 2
- 4
0
- 5 + 1
- 1
- 1
+ 7t + 1 6

Payrolls

Per cent
Per cent
Per cent
Per cent
Per cent
change
change
change
change
change
December
December December December December
1 955 from 1955 from 1955 from 1 955 from 1 955 from

R e a d in g . . . .
Scranto n. . . .

PRICES
Consum er....................................

3
0
5

+ 1 1

+

Department Store
Payments

Employ­
ment

mo.
ago
OUTPUT
M anufacturing production. . .
Construction contracts*........... C o a l m ining................................ +

DEC.
1955

-1

+

+

0
+1
0

9

7

+ 1

0

0 +1
+

6

+31

+

5 +

6

+37

+

7 +

5

+18 +40 +

-1

-1

8 -2 4 +

+10 +10 -

1

+16 +48 +

9 -2 1

+

6 +

9

3 +14 -

1

-1

+10 +58 +

5 -2 3 +

-2

+15 +52 -

4 -1 9

+

8

W ilk e s-B a rre

-1

+

4

W ilm ington. .

+1

+13

Y o r k ..............

+2

+

0
-1

4 +4

4 +11

7 -2 1

2

-1

5 +

6 +23 +

+

+

Trenton.

year
ago

+

5 +55 +

+21

+37 +

5 +

-8

+16 +15

5 -2 2 +

5 +

6 -2 5

8 +46 -1 3

+14 +5 0 +13 -2 4

+

+13 +

7 -

3

7 +11

’ N o t restricted to corporate limits of cities but covers areas of one or
more counties.