WATER SUPPLY, PLUMBING, ETC., FOR COUNTRY HOMES. 19 
Pipe friction should be included in computing the pumping height, 
as discussed under "Pumping." 
THE AUTOPNEUMATIC SYSTEM. 
In the autopneumatic system the water is delivered fresh from the 
well to the faucets. This system consists essentially of an air com- 
pressor driven by a small gas engine or electric motor, an air-tight 
steel air-pressure tank, and one or more autopneumatic pumps. No 
water tank is required, since nothing is stored but compressed air. 
The pump consists of two small metallic chambers submerged in the 
water, and when a faucet is opened they automatically fill and dis- 
charge, owing to the 
air pressure from the 
storage tank, thus /Jfc 
giving a continuous . 
flow of fresh water. 
Figure* 16 illus- 
trates the principle 
if 
£X*AUST K*IVS 
compr£3s£d 
Al/f 
£wB 
A IB I 
SXHAUSTIMj 
CVZJ/VP£ff A - 
P/SCHA&G//*a ■ 
- WATC/f 
of operation of the 
pump. Suppose a 
small air-tight tank 
A with inlet valve 
is submerged in 
water and allowed to 
fill. A discharge pipe 
B is connected at 
the bottom leading 
upward to faucet 
K. Compressed 
air is forced through 
pipe G into the 
top of the tank so 
that the water is 
f nrcpd mi t f hrmip-h " FlG * 16 -~ Princi P le of operation of an autopneumatic pump. 
the discharge pipe until the tank is emptied of water. A similar 
tank D is connected as shown. The pump has a device for auto- 
matically opening and closing the ah* valves and exhaust valves to the 
tanks alternately. While A is emptying of water D is filling, and 
they discharge alternately. 
Figure 17 A gives a front and side view of an autopneumatic pump 
and figure 17 B shows the entire working parts of a system and also 
how the pump may be used in bored and cased wells. 
Each pump requires an air-pressure reducer, shut-off and release 
cocks, pressure gauge, etc. The air-pressure reducer is necessary to 
reduce the high pressure carried in the tank to the uniform low pres- 
sure required to operate the pump. It is placed in the air-pipe line 
y\\ -I 
crd./A/oef? ~p " _ 
CXHAU3TIHG A/VP 
— &£f/LLING — ■ 
