[ 112 ] 
The velocity of the wheel at the maximum , as ap- 
pears above, was 30 turns a minute j which mul- 
tiplied by 9 inches, the circumference of the cylin- 
der, makes 270 inches ; but as the fcale was hung 
by a pulley and double line, the weight was only 
raifed half of this, viz. 135 inches. 
The weight in the fcale at the maximum 8 lb. o oz. 
Weight of the fcale and pulley o 10 
Counterweight, fcale, and pulley o 12 
Sum of the refinance 9 6 
or lb. 9,37 y. 
Now as 9,375 lb. is raifed 135 inches, thefe two 
numbers being multiplied together, the product is 
126 6, which exprefles the effetft produced at a ma- 
ximum : fo that the proportion of the power to the 
effeSl is as 3970 : 1266, or as 10 : 3,18. # 
But tho* this is the greatefl fmgle effedt producible 
from the power mentioned, by the impulfe of the 
water upon an underfhot wheel ; yet, as the whole 
power of the water is not exhaufted thereby, this 
will not be the true ratio between the power of the 
water, and the J'um of all the effefls producible 
therefrom : for as the water muft neceflarily leave the 
wheel with a velocity equal to the wheel’s circum- 
ference, it is plain that fome part of the power of 
the water muft remain after quitting the wheel. 
The velocity of the wheel at the maximum is 30 
turns a minute ; and confequently its circumference 
moves at the rate of 3,123 feet a fecond, which an- 
fwers to a head 1,82 inches j this being multiplied 
by the expence of water in a minute, viz. 264,7 lb. 
produces 48 1 for the power remaining in the water 
after it has paffed the wheel : this being therefore 
deducted 
