On ihe Illevation of Water, 



333 



• The accompanying section will serve to abridge the descrip- 

 tion of the parts. 



ifr^ 



/^ 



W 



A is a pump which draws water from the well W, about 

 twelve feet deep. C D is a pipe which branches from the in- 

 gress pipe S, and ascends fifteen feet above S to supply (by 

 means of a second pump B) the reservoir R. The bend in the 

 pipe at C was made that it may conform to the floor of an un- 

 derground cellar. 



When the pump A is worked, water rises up the pipe C D, 

 passing through the valves of the pump B, and is discharged 

 from thence, in a pulsatory manner, at every descent of the 

 piston A. 



The quantity which thus flows into R is about a quart in 

 seven minutes. But a contrivance belongs to the pump which 

 can be made to keep its piston-valve shut ; then it acts as a 



OCT.— DEC 1828. 2 A 



