( ) 
As for Example, in the Circle A D B a ( Fig. y . ) the 
Weights A and B being fuppofed equal, they imagine, 
that if ( by any Contrivance whatever ) vvhihl the 
Weight A defcribes the Arc A a, the Weight B is 
carried in any Arc , as B b, fo as to come nearer 
the Centre in its rifing, than if it went up the Arc B D ; 
the faid Weight fhall be overpois’d, and confequently,. 
by a Number of fuch Weights, a perpetual Motion will 
be produced. 
This is attempted by feveral Contrivances, which 
all depend upon this falfe Principle ; but I fhall only 
mention one, which is reprefented by Fig. 6. where 
a Wheel having two parallel Circumferences, has the 
Space between them divided into Cells, which being 
carv’d , will, ( when the Wheel goes round ) caufe 
Weights plac’d loofe in the faid Cells , to defeend on the 
Side AAA, at the outer Circumference of the Wheel ; 
and on the Side D to afeend in the Line B b b b, which 
comes nearer the Centre, aud touches the inner Cir- 
cumference of the Wheel. In a Machine of this Kind, 
the Weights will indeed move in fuch a Manner, if the 
Wheel be turn’d round, but will never be the Canfe 
of the Wheels going round. Such a Machine is men- 
tioned by the Marquis of JTorcefter, in his Century of 
Inventions in the following Words, N°. 5 6 . 
“ To provide and make that all the Weights of the 
a defeending Side of a Wheel, fhall be perpetually 
* c farther from the Centre, than thole of the mount- 
“ ing Side, and yet equal in Number, and heft to 
<c the one Side as the other. A moft incredible thing, 
a if notfeen ; but tried before the late King (of b lef- 
<c fed Memory ) in the Tower by my Directions, two 
w extraordinary Ambattadors accompanying his Ma- 
- r " " i d . ' “ jetty, 
