( 175 y 
without any regard to the time, as Monfieur Leibnitz,^ 
and his followers have affirmed, P ought to be raifed, 
when C falls only from E, or two Foot, which never 
happens ; or, if the Stroke was proportionable to the 
Mafs multiplied into the fquare of the Velocity, when 
C falls from F, then P might weigh four Pound, where- 
as the Experiment will never lucceed under thofe Cir- 
cumftances. 
I know it is objedted, that the Blow cannot be al- 
ways diredf, and that the String that goes through the 
hole in the falling Weiglit, to guide it in its Fall, caules 
a fenfible Fridrion, and therefore that fomething of the 
Force is thereby loft. But we are to obferve, that if 
that vras all, there would be no need of railing up C 
in the fecond Cafe quire up to F, inftead of E, whereas 
in Fad:, it muft always be raifed beyond F, to allow 
for the Fridtion, that hinders it from producing a dou- 
ble Eftedt in failing from F. For if the Experiment 
be repeated an hundred times, the Weight, P when of 
two Pounds, will never be raifed by letting Cfall ftom 
any place between E and F. 
EXPERIMENT III. 
If (in order to avoid Fridlion) inftead of a Blow 
ftruck upon the end B, by the falling Body, the laid . 
Body C be faftned to a pretty long String tied to the 
button as at r, and ftrft lifted up one Foot, and 
then let fall ; fo that in falling oneFoof^ it may pull 
down B, and lift up' A with the Weight P of one 
Pound ; whenever P is two Pounds, C muft fall from a 
height greater than f or four Foot, otherwile it will 
not raim the Sraehium A, elpecially if it be let fall 
between e and f. 
EXPE- 
