[ 1 2 3 ] 
of 20 to 153 but as the effedt: approaches neareft 
to the ratio of 20 to 15, or of 4 to 3, when the 
power is greateft, whether by increafe of velocity, or 
quantity of water, this feems to be the moft appli- 
cable to large works : but as the load that a wheel 
ought to have, in order to work to the heft advan- 
tage, can be affigned, by knowing the effedt it ought 
to produce, and the velocity it ought to have in pro- 
ducing it 3 the exadt knowlege of the greateft load it 
will bear, is of the lefs confequence in pradtice. 
It is to be noted, that in all the examples under the 
three laft of the four preceding maxims, the effedt 
of the leffer power falls fhort of its due proportion 
to the greater, when compared by its maxim 3 except 
the laft example of maxim 4th : and hence, if the 
experiments are taken ftridlly, we mult infer, that 
the effedts increafe and diminifh in an higher ratio 
than thofe maxims fuppofe : but as the deviation is 
not very confiderable, the greateft being about i-8th 
of the quantity in queftion 3 and as it is not eafy to 
make experiments of fo compounded a nature with 
abfolute precifion 5 we may rather fuppofe, that the 
leffer power is attended with fome fridtion, or vvorks 
under fome difadvantage, which has not been duly 
accounted for, and therefore we may conclude, that 
thefe maxims will hold very nearly, when applied to 
works in large. 
After the experiments above mentioned were tried, 
the wheel, which had originally 24 floats, was re-* 
duced to twelve 3 which caufed a diminution in the 
effedt, on account of a greater quantity of water 
efcaping between the floats and the floor 3 but a cir- 
R 2 cular 
