162 



WELLS'S NATUKAL PHILOSOPHY. 



Fig. 154 



piHiHi|inmii 1 I i^tiii II nil] ili 'll,, li'J |ll|l|l|'||'Hllllll|IIH_ 



T ! 1 



^te^i^^^^^^^'^^*'^-'^''^^ ^ "^^^ ^ ^ "^^ '^ 



As this machine produces a kind of intermitting motion from the alternate 

 flux and reflux; of the stream, accompanied with a noLse arisinsr from the shock, 

 its action has been compared to the butting of a ram ; and hence the name of 

 the machine. 



It will be seen from these details, that a very insignificant pressing column 

 of water, running in the supply pipe, is capable of forcing a stream of water 

 to a very great height, so that a sufficient fall of water may be obtained in any 

 running brook, by damming up its upper end to produce a reservoir, and then 

 carrying the pipe down the channel of the stream until a sufficient fall is 

 obtained. A consideralile length of descending pipe is desirable to insure tlio 

 action of tiie stream, otherwise the water, instead of entering the air-vessel, 

 may be thrown back, when the valve is closed, into the reservoir. 



