20 



BULLETIN 57, U. S. DEPAHTMENT OF AGRICULTUKE. 



between the aii- tank and the pneumatic pump. It can be adjusted 

 to the proper pressure with an ordinary wrench. The proper work- 

 ing pressure requiied to operate the pump and raise water to the 



PP/M/NG COCH 



3/3" rss 



\ 3/S" Te£- 



f^ AN HOLE 



— \ /I Iff scffi>fi>tr f>//>s 



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SH/PT/NO LEy£R 



/ " t^A TS/7 £>/S- 

 C/ZAPG^ /=>//>£■ 



ky£J.i. CAS/AJG 



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-AUTO - PA/eUMAT/e 



V/£W 



Fig. 17. — Working parts of an autopneumatlc pumping system: A, Front and side view; i?, entire working 

 sj-stem as used in bored or eased wells. 



required height in the building is recorded on the pump gauge 

 placed on the air-pipe hne between the reducer and the pump. The 

 following table shows the number of gallons of water that can be 



