130 DOMESTIC WATER SUPPLIES FOR THE FARM 



fairly continuously and with some velocity, windmills are often a 

 satisfactory source of power, although even here it is often neces- 

 sary to provide large storage tanks or other reservoirs to tide over 

 periods of calm or light winds. The windmill is most satisfactory 

 when the water does not have to be lifted through any great 

 height, and fails (because of insufficient power) in very deep wells 

 when the water is far below the surface. 



In most cases where windmills are inexpedient, gasoline en- 

 gines will be found the most satisfactory source of power for 

 pumping. Gasoline is fairly cheap, easily obtainable and highly 

 efficient, while the fact that the engine may be started at a 

 moment's notice whenever water is required makes its use second 

 to none in convenience. 



