THE COMMON PUMP OR LIFTING PUMP 323 



J 



b, piston 



d, suction or 

 inlet pipe 



J 



c, air- 

 tight 

 cylinder 



J 



a, suction 

 valve 



f 



I'll 



FIG. 194, Diagram of the process of pumping. 



CLARK INTRO. TO SC. 



