DRIVEN MACHINES 



107 



Air Pressure Pump. Instead of pumping water out 

 of the well some farmers pump air into the well to force 

 the water out. A double compartment cylindrical tank 

 is placed in the water in the well. These tanks are con- 

 nected with the farm water distributing system to be 

 carried in pipes to the house and to the stock stables. 

 Air under a pressure of from 50 to 100 pounds per 



Check 



Air Compressor ^Gasoline Engine^ 



Drain Cock c To Water" 



Distribution System^ 



Submerged Pump- 



Figure 120. Air Pressure Pump. Pumping water by air pressure 

 requires a large air container capable of resisting a pressure of 100 

 pounds per square inch. This illustration shows the pressure tank, 

 engine, air-compressor, well and submerged pump. 



square inch is stored in a steel tank above ground. 

 Small gas-pipes connect this air pressure tank with 

 the air-chamber of the- air-water tank in the well. A 

 peculiar automatic valve regulates the air so that it 

 enters the compartment that is filled, or partly filled, 

 with water, and escapes from the empty one so the two 

 compartments work together alternately. That is, the 

 second chamber fills with water, while the first cham- 

 ber is being drawn upon. Then the first chamber 

 fills while the second is being emptied. This system 



