FARM MOTORS 



363 



The average farm well will not furnish water faster than 

 it could be pumped with a small 1^- or two-horsepower 

 engine; so a larger load cannot be provided by increasing the 

 size of the pump or the number of strokes per minute. The 

 question is often asked, when 

 the purchase of an engine 

 for pumping is contemplated, 

 whether it would not be best 

 to purchase a much larger 

 engine than actually needed 

 in order that it may be used 

 for other work. If the pufnp- 

 ing is to be continuous, that 

 is, every day, it will be found 

 more economical to buy a 

 small engine to do the pump- 

 ing and a comparatively 

 larger one for the other work. 

 This will be explained by 

 the following calculation: 



Fuel per year for 1 ^-horse- 

 power engine, light pumping load, 

 2 hours per day, equals 0.2 gal- 

 lons times 365, or 73 gallons. 



Fuel per year for 8-horse- 

 power engine, light pumping load, 

 2 hours per day, equals 0.45 gal- 

 lons times 365, or 164.3 gallons. 



Difference equals 164.3 73, Fig. 233. A special type of engine 



or 91.3 gallons. 



At 15c per gallon, 91.3 times 15c equals $13.69. 



This will more than pay for the interest on the cost of the 

 smaller engine, and its depreciation. If the comparison be 



