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jefty, and the Duke of Richmond, and Duke o*" f/h- 
™l een ’: with moft of the Court attending him. The 
Wheel was fourteen Foot over, and had fourty Weights 
of fifty Pounds a Piece. Sir William Balfbre, then 
Lieutenant of the Tower, can juftify it, with 
ieveral others. They all faw, that no fooner thefe 
great Weights pafled the Diameter Line of the lower 
hide, but they hung a Foot farther from the Centre • 
nor no fooner paiTed the Diameter Line of the upper’ 
Sioe, but they hung a Foot nearer. Be pleated to 
judge the Confequence. 
Now. the Confequence of this, and fuch like Ma- 
cbines, & nothing lefs, than a perpetual Motion ; and 
the Fallacy is this. The Velocity of any' Weight is 
not the Line, which it deferibes in General, but the 
Height that it rifes up to, or falls from, with refpeft 
to its Diltance from the Centre of the Earth. So that 
when the Weight ( Fig. y. ) deferibes. the Arc A a, its 
Velocity is the Line A C, which Ihews the perpen- 
dicmar Defcent ( or meafures how much it is come 
nearer to the Centre of the Earth ) and likewife the 
Line B C denotes the Velocity of the Weight B, or the 
Height that it riles to, when it afeends in any of the 
Jrcs B b, inftead of the Arc B D : So that io this Cafe 
whether the Weight B in its Afcent be brought nearer’ 
the Centre or not, it lofes no Velocity, which it ouoht 
to do, in order to be rais d up by the Weight A. Nay 
the weight in rifing nearer the Centre of a Wheel’ 
may not only not lofe of its Velocity, but be made 
to gam Velocity, in Proportion to the Velocity of its 
counterpoizing Weights, that defeend in the Circum- 
ference of the oppofite Side of the Wheel ; for if we 
confider two Radij of the Wheel, one of which is 
4 ' Bori- 
