( ii6 ) 
more inconvenient than an h Perltrochio with 
the fame Proportions ; and like wife that it has more 
Friftion than the fame Machine in the common Ufe. 
ace, (Fig. 1.) is a commow yd xis in Perltrochio^ 
which has the Wheel A E five Times bigger in Dia- 
meter than the Axel ^ fo that AC, the, Radius of the 
Wheel (which is the Diftanc^ of^he Power) is to CB 
the Radius of the Axel (the DiRance of the Weight) 
as 5 to *i : Confequently One (for Example one Ounce, 
• as in our Experiment) will keep five in iEquilibrio. 
Now though the Fridlion of the Gudgeon at C -is un- 
avoidable, yet. it may be diminifii'4 by .diminifliing 
the Diameter of the Gudgeon, provided it remains 
ftrong enough to fuftain the Machine and its Burthen. 
Here one Penny- weight, or of the Power added to 
it, makes it preponderate, and give the Machine, Mo- 
ition with a due Velocity. .. w 
N ow this very Engine made ufe of in Monf. Permlfs 
AVay, does fo alter the Diftances of the. Weight and 
Power, that inftead of One for our Power, we muft 
have Two and a half to keep the very fame Weight 
Five, in iEquilibrio, as may appear by a Sight of the 
third Figure, where, fince in the Adion of theMachinej 
when we pull, the Rope P A, we makerthe Axel DB 
to wind itfelf up upon the Rope H D, it is evident that 
D is now become the Center of Motion, D B (the 
whole Thicknefs of the Axis) the DiRance of the 
Weight ; and the Diftance of the Power is re- 
duc’d to A D = 4. So that if two Men, having been 
employ’d in the common Way to raife Weights equal 
to the Strength of ten Men, an Engineer (hould alter 
the Manner of working, and fit up the ydxis in Peru 
trochio in Monf. Peraulfs Way, inftead of gaining 
an 
r 
