.sy/i 1 WILLIAM SIEMENS, F.R.S. 149 



Plate L>8, where A and B are two closed air-tight chambers fixed 

 at a height of from 16 to 20 feet above the level of the water to be 

 raised; inlet valves C are provided in the bottom of the chambers 

 for the water to enter from the suction pipe I), and outlet valves (T 

 for the discharge of the water raised. The exhauster E, supplied 

 with steam by the pipe H, exhausts the air from the chambers 

 A and H through the pipe F, which is provided with a reversing 

 vuKv L for placing the exhauster in communication with each 

 of the two chambers alternately ; and the delivery end of the 

 rxhaiisU-r, which may be closed by a valve, also communicates 

 with the chambers through the pipe K and the same reversing 

 valve L. The chamber A is provided with a float M, the rod of 

 which works by tappets the tumbling lever N, and this throws 

 over the weighted lever of the reversing valve L by means of the 

 looped rod R. 



The action of the apparatus is as follows. While the exhauster 

 is drawing the air out of the chamber B through the pipe F, 

 as shown in Fig. 13, thus causing the water to rise into the 

 chamber through the suction pipe D under the pressure of the 

 atmosphere, the discharged jet of combined steam and air from 

 the exhauster passes through the pipe K into the top of the other 

 chamber A, which is full of water. The water in this chamber 

 will consequently flow out through the bottom outlet valve G, 

 its discharge being aided by the forcing action of the entering 

 current of steam and air from the exhauster ; and this forcing 

 action may be regulated by closing the top of the delivery funnel 

 of the exhauster, in which case the discharge pipe for the water 

 from the outlet valve Gr may be raised above the level of the 

 chamber A. As the water descends in the chamber A, the float M 

 sinking with it moves over the tumbling lever N into the vertical 

 position, from which when the chamber is emptied the lever will 

 fall into the reversed position, thereby throwing over the reversing 

 valve L. The action of the exhauster upon the two chambers is 

 now reversed, the air being exhausted from the emptied chamber A, 

 and the combined jet discharged into the chamber B, which during 

 this time has become filled with water ; in this way the two 

 chambers become alternately filled and emptied, and a continuous 

 delivery of water is thus obtained. As the steam contained in the 

 combined jet entering either chamber from the exhauster becomes 



