WATER SUPPLY, PLUMBING, ETC., FOR COUNTRY HOMES. 21 
drawn from faucets with the pump under working pressures varying 
from 25 to ?-5 pounds and total starting pressures in a 1,000-gallon 
ah* tank varying from 40 to 100 pounds: 
Pumping capacity of a 1,000-gallon air tank, in gallons, under varying internal pressures. 
Work 
pressure 
on pump 
guage. 
Total pressure in air tank at start. 
40 pounds. 50 pounds. 
60 pounds. 
70 pounds. 
80 pounds. 
90 pounds. 
100 pounds. 
Pounds. 
25 
30 
35 
40 
45 
50 
Gallons. Gallons. 
375 259 
221 442 
102 306 
1S7 
Gallons. 
833 
663 
510 
374 
255 
153 
68 
Gallons. 
1,075 
884 
714 
561 
425 
306 
204 
119 
51 
Gallons. 
1,310 
1,105 
924 
748 
Gallons. 
1,548 
1,326 
1,123 
936 
Gallons. 
1,786 
1,548 
1,327 
85 
596 765 936 
460 612 765 
330 476 612 
237 375 476 
153 ^55 357 
60 
65 
j 
AUTO RHEUMATIC POMP 
Fig. 18. — Application of autopneumatic system to a farm home. 
For air tanks of other than 1,000-gallon capacity divide the figures 
in the table by 1,000, move the decimal point three places to the left, 
and multiply the result by the capacity of the tank in gallons. 
Assume, for example, that the height to which the water is to be 
raised and the pressure required to operate the pump, including 
friction, make necessary a working pressure of 40 pounds on the 
pump. Then if the initial pressure in the air tank is 50 pounds, 187 
gallons of water can be delivered at the faucets before the pressure hi 
the air tank becomes too low to operate the pump. 
The autopneumatic pump can be used in wells, springs,, or lakes 
where the water is tree from sand and mud and does not have to be 
