AN APPRAISAL OF POWER USED ON FARMS 
9 
A large number of operations come under the '' Miscellaneous " 
headings and the information available does not justify any esti- 
mate of the amount of power used by each. Of those not listed the 
principal draft operations are ditching, land levehng, and grading; 
and the miscellaneous stationary work consists principally of the 
operation of stone crushers, cane mills, cotton gms, spraying ma- 
chinery, milking machines, cream separators, churns, grain elevators, 
seed cleaners and graders, hay hoists, tool grinders, washing ma- 
chines, and household apphances. 
NUMBER OF POWER UNITS OR INSTALLATIONS ON FARMS AND 
NUMBER OF WORKERS ENGAGED IN AGRICULTURE 
In Table I of the Appendix is given an estimate of the number of 
horses, mules, trucks, tractors, stationary engines, and electrical 
installations by States, available on farms January 1, 1924, and the 
number of agricultural workers as reported by the Fourteenth 
Fig. 6.— Estimated distribution of work animals on farms in 1924. Each dot represents 5,000 
animals. Based on reports of the Bxireau of the Census corrected according to estimates 
from the Division of Crop Estimates, Bureau of Agricultural Economics, Department of 
Agriculture 
Census. The distribution of work animals and tractors is shown in 
Figures 6 and 7. 
The estimated total number of power units now available on farms 
in the United States is as follows : 
Oxen 200,000 
Horses 15, 916, 000 
Mules 4, 654, 000 
Tractors 450,000 
Trucks 356,000 
Stationary engines 2, 500, 000 
Electric installations 500, 000 
Windmills 1, 000, 000 
Automobiles on farms 4, 500, 000 
Some water power is used in certain areas, but the total amount 
is insignificant compared with the total of all kinds of power. The 
mndmills are used mainly in the Central West and in some places 
along the sea coast where the average wind velocity is sufficient to 
justify their use. 
68326°— 26 2 
