[> 56 ] 
Inches diameter, turn on the peripheries of the wheels 
G, 3 feet diameter, 9 revolutions of the pevets f> 
are equal to 1 revolution of the wheels G ; and the 
circumference of the pevets /, being 4 times the 
circumference of the pevets g , the fpace the pevets J, 
would have rubbed on a dead furface in one revolution, 
is equal to the fpace the pevets g rub on a dead fur- 
face in 36 revolutions of the pevets therefore the 
velocity of the pevets y, being \. 6 to velocity of the 
pevets g, and the velocity of the power D in the 
wheel A being 6 _° to the velocity of the pevets f y 
the velocity of the power D, to the volocity of the 
pevets g, is x V = * V S° ^ at 
13250 pound, which was the weight equal to the 
quantity of fridtion in the pevets J or a power 
fomewhat more than 6 pound 2 ounces in the wheel 
A, will be fufficient to overcome the refinance from 
fridtion in the pevets g. 
To reduce this quantity of fridtion to a lefs degree, 
let each of the pevets g, be placed on the peripheries 
of the wheels H, 2 feet diameter, vvhofe pevets h 
are 1 . inch diameter j and the whole fridtion will then 
be transferred from the pevets g, to the pevets h ; by 
which the velocity of the power in the wheel A, to 
the velocity of the part rubbing on a dead furface, in 
the pevets f, will be in a ratio of 2 0 7 1 3 6 °. bor the 
circumference of the pevet g, being of the cir- 
cumference of the wheel H, on which it turns, makes 
24 revolutions, for 1 of the pevet h. And the cir- 
cumference of the pevet g, being 4 times the cir- 
cumference of the pevet h t the fpace the pevet g 
would have rubbed on a dead furface in 1 revolution, 
is equal to the fpace the pevet h rubs in 96 revolutions j 
therefore 
