272 



FARM MACHINERY 



tity of water is to be moved through a short lift, as in 

 drainage and irrigation work. They 'are efficient machines 



FIG. 194 SECTION OF A ROTARY PUMP SHOWING PISTONS 



for low lifts at least, and will handle dirty water better 

 than any other kind of pump. Centrifugal pumps are 



FIG. IQ5 CENTRIFUGAL PUMP 



made with either a vertical or a horizontal shaft. The 

 pumps with a vertical shaft are called vertical pumps and 



