40 BULLETIN 495, U. S. DEPARTMENT OF AGRICULTURE. 
ning on direct current. The chief factor affecting the price of a given 
motor is the speed for which it is built—the lower the.speed the 
higher the price. Table 9 gives the range in price per horsepower 
for simple types of motors adaptable to ordinary pumping condi- 
tions. The prices do not include cast-iron sliding bases, pulleys, 
wiring, etc. 
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