FARM SANITATION 



487 



against a head of 100 feet, or, in other words, lifted that dis- 

 tance, for every day in the year, at a cost of less than 

 five dollars for gasoline. Again, 

 the gasoline engine does not need 

 constant attention. If anything 

 goes wrong, the engine will likely 

 stop without doing damage. A 

 float or other safety device may 

 be connected with the igniting 

 system or fuel supply in such a 

 way as to stop the engine when a 

 certain height of water in the 

 supply tank or a certain pressure 

 has been attained. 



Hot-air engines have little to 

 commend them other than their 

 reliability and safety. Solid fuel 

 of almost any kind, as well as oil 

 and gas, may be used. They are 

 not economical of fuel, but where 

 the fuel is cheap they may be oper- 

 ated at a reasonable expense. 



Water wheels can be used only in 

 rare instances, and will not be dis- 

 cussed for this reason. There are, 

 no doubt, many places where they 

 may be used to advantage. 



The pump is as important a 

 part of the pumping plant as the 

 motor. Pump troubles and repairs 

 are always very annoying, and a pump of good constructio n 

 and properly installed is always a good investment. The 

 amount of power required to operate a pump is small, as will 

 be shown by the following table : 



Fig. 302. A good type of 

 three-way or underground 

 pump. This pump is provided 

 with a hydraulic cylinder to 

 throw the windmill out of 

 gear when a certain pressure 

 has been reached. 



