( V4 ) 
EXPERIMENT IV. 
■i 
I took the Weight C of feventeen Ounces Troy, 
which was a round ball of Lead with a hole through the 
middle of it, and having palTed the String N-X through 
it, before it was faftened to the Hook X, I placed the 
whole Machine in fuch manner, that the String being 
flretchcd by the Weight N, went through the hole of 
the Weight C, and likewile through the hole of the 
Brachium B, upon yhich C lay, without touching 
the Tides of the hole either in the Weight or Ballance ; 
then having put fiich a Weight P in the oppofite Scale, 
as C falling from the height of one Inch, was able to 
raife high enough, to let loofr the Spring g h from the 
Button : I added to P another Weight equal to it, 
and then letting fall C along the String that guided it, 
from an heighth of two Inches, then of three, and then 
exacfrly of four, it would not raife the double Weight 
P to the former height, but falling from five Inches, 
or a little higher, it raifed it up. ^ , 
EXPERIMENT V. 
\ 
Leaving every thing as it was before,. I changed the 
Weight C for another leaden Ball of twice the Weight, 
which falling from one Inch, raifed the double Weight 
P to the ulual height ; then changing the Weight B 
in any Proportion, whatever height was requir’d for 
the heavieft Ball C (or C z) to fall from, in order to 
raife the Weight at P ; more than four times the height 
was required for the firft Ball C, to raife the fame 
Weight fb high, as to let loofe the Spring. 
EXPE- 
