1 23s ) 
a Weight In Its Defcent will always preponderate, and 
caufe a Weignt equal to it to rife, provided it comes 
nearer the Centre in its Rife ; and accordingly as it 
felonies, will be overbalanced by another Weight equal 
to it ; and therefore they endeavour by various Contri- 
vances to produce that Effed, as if the Confequence of 
it would be a perpetual Motion. 
But I fhall fhew, that they miftake one particular 
Cafe of a general Theorem , or rather a Corollary of it, 
Tor the Theorem it felf. The Theore?n is as follows : 
• » 
Theor. If one Weight in its Defcent, does by Means 
of any Contrivance, caufe another Weight to afcend 
with a lefs Momentum or Quantity of Motion than it 
felf, it will preponderate and raife the other Weight. 
Cor. 1. Therefore if the Weights be equal, the def- 
cending Weight muft have more Velocity than the 
afcend in g Weight, becaufe the Momentum is made up 
of the Weight multiplied iuto the Quantity of Mat- 
ter. 
Co/. 2. Therefore if a Leaver or Balance, have e- 
qual Weights fatten’d or hanging at its Ends, and the 
Brachia be e\*er fo little unequal, that Weight will pre- 
ponderate, which is fartheft from the Centre. 
SCHOLIUM. 
This Second Corollary caufes theMittake ; becaufe 
thofe, who think the Velocity of the Weight is the 
Line it defcribes, exped that that Weight (hall be 
overpois’d, which defcribes the fhorteft Line, and there- 
fore contrive Machines , to caufe the afcending Weight 
to defcribe a fliorter Line than the defending Weight. 
Kk a As 
