PUMPING WATERS. 79 



nexion with estate water supply. In nearly every 



trn I I iTfi 



Detail 



wi separate 



sheet. 



FIG. 61. 



case it can be placed at the surface, and is known 

 as the single, double, or treble 

 ram pump as the case may be. 

 It is certainly the most simple, 

 efficient and convenient class of 

 pump for the purpose. Single 

 and double rams are used where 

 the supply is only very small, 

 but where possible it is advis- 

 able to use a treble ram pump, 

 as the flow of water is much FIG. 61 A. 



steadier and the pump lasts much longer. In any 



