( ) 
Scale S, and Weights E, which amounted to 1 6 
Pounds. A little more Weight added feparated them, 
and, upon viewing the touching Surfaces, it appear d 
that they did not exceed a Circle of iV Inch Diame- 
ter ; but this Surface can hardly be meafur’d exactly, 
on account of its Irregularity. The Experiment was 
repeated feveral Times, and the Cohefion of the Balls 
was different every Time. 
On ThwfJay the 6th of this Month, I made the 
Experiment another Way, at the Meeting of the So- 
ciety, and juft after their Riling, before feveral of the 
On the upper Pin or Bar of the Wooden Frame 
D d 1 H, I fufpended the Steelyard E F, whofe Hook 
held up a leaden Ball A of two Indies in Diameter, 
bavin? an Hole thro’ it, at A, to receive a String ; the 
lower Ball B equal to, and prepar’d in the fame Man- 
ner as the firft, receiv’d the Pin 0 o thro’ its String, 
fo that G, the Weight of the Steelyard, was made Ule 
of to feparate the Balls, which happen’d when it was 
applied at the Number 20, in the firft Experiment ; 
but in the three following Experiments, the Balls were 
not feparated till the Weight was remov’d to the Num- 
bers 25, 37, and 45, expreffing Pounds on theSteel- 
5 Laftiy, the Balls being applied together as before, 
ftill cleaning the Surface of Contaft with my Knife, 
and never making a Contact fenfibly greater than 
what I mention’d before; the Weight G remov d 
quite to the End F, where it Weigh d 47 Pounds, 
was not able to feparate the Balls, lo that I was ob- 
lig’d to make Ufe of another Steelyard ; but as I in- 
tended to begin my Trials with the Weight, at the 
Number 47 upon this laft Steelyard, b y,¥‘ fta H’ 
plied a wrong Weight inftead of G, which, being ; of 
