14 
BUL1.ETIN 1348, U. S. DEPAETMENT OF AGEICULTUEE 
5 
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50 
100 
(/ni/ed States 
Maine 
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l/ermont. 
Massachusetts 
Rhode Island.... 
Connecticut. 
t/etvYork 
A/ew Jersey. . , 
Pennsylvania. . . 
Delaware 
Maryland. 
l/irginia., 
Westl^irginia... 
North Carolina. 
South Carolina. 
Georgia 
Florida 
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Tennessee 
Alabama..^., 
Mississippi.. 
Arkansas 
Louisiana 
Oklahoma'. '....'. 
Inai'a'na'.J. '. '.'.'.. 
ininois 
Michigan 
Wisconsin 
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Iowa . 
Missouri..^ 
A/orth Dakota.. . 
South Dakota... 
Nebraska. 
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Wyoming _ 
Colorado, 
New Mex/co 
Arizona.... 
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Fig. 15.— Average horsepower-hours per 
proved acre per year 
12 shows the approximate dis- 
tribution of hours of hunaan 
labor utilized annually. 
The figures for horsepower- 
hours per improved acre have 
been given for convenience in 
estimating the amount of power 
utilized on different sizes of 
farms, as this unit appears to 
be the one most suitable to use 
for this purpose. The approxi- 
mate power used on any size of 
farm can be obtained by multi- 
phdng the number of improved 
acres in the farm by the average 
horsepow^er-hours utilized per 
improved acre. 
EFFECT OF THE USE OF POWER 
AND MACHINERY ON PRO- 
DUCTION AND INCOME 
Those areas which make a 
greater use of power and ma- 
chinery usually show a corre- 
spondingly greater volume of 
production per worker. Figure 
17 shows, by States, the relation 
existing between investment in 
machinery per worker as of 
January 1,1920, and tjie average 
value of crops produced in the 
Fig. 16.— Average horsepower-hours of power utilized per hour of human labor on farms 
