20 
BULLETIN 57, TJ. S. DEPARTMENT OF AGRICULTURE. 
between the air tank and the pneumatic pump. It can be adjusted 
to the proper pressure with an ordinary wrench. The proper work- 
ing pressure required to operate the pump and raise wtter to the 
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Fig. 17.— Working parts of an autopneumatic pumping system: A, Front and side view; B, entire working 
system as used in bored or cased wells. 
required height in the building is recorded on the pump gauge 
placed on the air-pipe line between the reducer and the pump. The 
following table shows the number of gallons of water that can be 
