446 PHILOSOPHICAL TRANSACTIONS. [aNNO 1731, 



Then the crank pulls the libra 3 feet from the forcer, and 8,3 feet froni the 

 centre. 



7 ton 

 X 11,3 



8>3) 79,1 (9,5 ton on the crank. ton 



vvallower 2,2) 9,5 (4,3 on the trundle 

 the spur-wheel 4 



The radius of the great wheel 10) 17,2 (1,72 ton 



20 



The force on the floats 18 ct. 40 lb. 34,40 ct. 



But to allow for friction and velocity, may be reckoned ji 



The ladles or paddles 1 4 feet lone;, ? „^ ^ -- . 



. , / o' J. = 22,4 square feet. 

 1 8 mches deep i 



The fall of water is sometimes 2 feet 



44,8 



6 gallon in a cubit foot 

 268,8 



10 lb. in a gallon 

 11 )2688(24 hundred. 

 The velocity of the water 4 feet in 21'" of time. 

 2l'" : 4 feet :; 6o* : 685 feet per minute. 



The quantity expended on the wheel, according to the velocity of the stream 

 1433 hogsheads per second. 

 But at the velocity of the wheel 645 hogsheads per second. 

 The velocity of the wheel to the velocity of the water, as 1 to 22. 

 Mr. Beighton makes the following observations on these water-works. 

 Though tliey may be justly esteemed as good as any in Europe; yet there are 

 some things, as he conceives, which might be altered very much for the 

 better. 



1. If instead of l6 forcers, they worked only 8, the stroke might be 5 feet 

 in each forcer, which would draw a great deal more water with the same power 

 on the wheel; for, then there would be but 4 the opening and shutting of 

 valves; consequently, but half that loss; and a 5-foot stroke draws above dou- 

 ble the quantity of 2 strokes of 2-1- feet each, by near l, as the velocity is 

 double; which is the most valuable consideration in an engine, where the pipes 

 will sustain such force. 



