( 8 ) 
the Water is forced up to any Height or Place re- 
quited. 
Befides thefe four Forcers, there are four more placed 
at the other Ends of the Libra?, or Levers (not (hewn 
here to avoid Confufion, but to be feen on the left 
Hand) the Rods being fixed at a i, x , 3, 4, working in 
four fuch Cylinders, with their Parts d d , &c. e e, 
/> and as before defcribed, Handing near kk. 
At the other End of the Wheel (at B) is placed all 
the fame Sort of Work as at the End A is defcribed. 
viz. 
The Cog-Wheel I. 
The Trundle K. 
The Spindle X. 
The Crank _ Y, Z. 
The fucking Pipes f. 
The four Levers ac, ac, &c. 
8 forcing Rods a d, a d ,&c. 
8 Cylinders de , de, &c. 
4 Trunks, fuch as ee,h h. 
2 forcing Pipes, as i. 
So that one fingle Wheel works 16 Pumps. 
All which Work could not be drawn in one per- 
fpe&ive View, without making it very much con- 
fufed. 
A Calculation of the Quantity of Water raifed by 
the Engines at London-Bridge. 
In the ift Arch next the City is one Wheel) , P 
with double Work of — L j 16 Forcers. 
r ift Wheel double Work at one 
In the 3d\ End, and fingle at the other 
Arch ^xd Wheel in the Middle — • ~~ 8 
(3d Wheel — — 1 6 
In all yx Forcers, 
IX 
One 
