FARM WATER-WORKS 159 



which there is no possibility of contamination by dust and insects. 

 If properly located, the system is free from freezing troubles in 

 winter, while giving a cool, aerated and palatable supply in sum- 

 mer. There is slight danger of collapse and little trouble with 

 leakage. Moreover, it is a flexible system and can be extended 

 to supply other and higher fixtures by simply increasing the 

 pressure. 



The cost of a pneumatic system varies with its capacity and 

 the power used. A 22O-gallon tank of a working capacity of 150 

 gallons with equipment, including hand pump and fixtures, can 

 be had for about $60, but larger tanks cost considerably more. 

 Although the original outlay is greater than for elevated tanks, 

 the pneumatic tanks will last much longer, require fewer repairs, 

 and demand relatively little attention. 



