[ ”3 ] 
dedudled from the original power 3970, leaves 3480, 
which is that part of the power which is fpent in 
producing the effedt 1266} and confequently the 
part of the power fpent in producing the effedt, is to 
the greateft effedt producible thereby as 3489 : 1266 
: : 10 : 3, 62, or as 1 1 to 4. 
The velocity of the water striking the wheel has 
been determined to be equal to 86 circumferences of 
the wheel per minute, and the velocity of the wheel 
at the maximum to be 30 ; the velocity of the water 
will therefore be to that of the wheel as 86 to 30, or 
as 10 to 3,5, or as 20 to 7. 
The load at the maximum has been diown to be 
equal to 9 lb. 6 oz. and that the wheel ceafed move- 
ing with 1 2 lb. in the fcale : to which if the weight 
of the fcale is added, viz. 10 ounces *, the propor- 
tion will be nearly as 3 to 4 between the load at the 
maximum and that by which the wheel is flopped. 
It is fomewhat remarkable, that tho’ the velocity 
of the wheel in relation to the water turns out greater 
than -j of the velocity of the the water, yet the im- 
pulfe of the water in the cafe of a maximum is more 
than double of what is affigned by theory ; that is, 
inflead of | of the column, it is nearly equal to the 
whole column. 
It muft be remembred, therefore, that, in the pre- 
fent cafe, the wheel was not placed in an open river, 
where the natural current, after it has communicated 
its impulfe to the float, has room on all fides to ef- 
cape, as the theory fuppofes ; but in a conduit or 
* The refiftance of the air in this cafe ceafes, and the fridfion 
is not added, as I2lb. in the fcale was fufficient to ftop the wheel 
after it had been in full motion ; and therefore fomewhat more 
than a counterbalance to the impulfe of the water. 
Vol. u. Q_ 
race. 
