200 



PUMPS AND THEIR VALUE TO MAN 



to over 300 feet before a flow was obtained sufficient to satisfy 

 the owner. The water thus obtained was to be the sole 

 water supply of a hotel accommodating 150 persons; the 

 proprietor calculated that the requirements of his guests, 

 for bath, toilet, laundry, kitchen, etc., and the domes- 

 tics employed to serve them, together with the livery at their 

 disposal, demanded a flow of 10 gallons per minute. The 

 ground was full of rock and difficult to penetrate, and it re- 

 quired 6 weeks of constant work for two skilled men to drill 



FlG. 142. Showing how drinking water can be contaminated from cesspool (c) and 



wash water (w). 



the opening, lower the suction pipe, and install the pump, 

 the cost being approximately $700. 



The water from such a well is safe and pure except un- 

 der the conditions represented in Figure 142. If sewage 

 or slops be poured upon the ground in the neighborhood 

 of the well, the liquid will seep through the ground and 

 some may make its way into the pump before it has been 

 purified by the earth. The impure liquid will thus contami- 

 nate the otherwise pure water and will render it decidedly 

 harmful. For absolute safety the sewage discharge should 



