( 345 ) 
As foon a s the Revolution of the Machine ceafes, 
the Colures, Meridians or Hoops return to their El- 
liptiral Figure, whofe iongeft Diameter is the Axis 
or Revolution. 
If the Force, by which the Hoops endeavour to 
keep their Figure, be confider’d, as the Gravity that 
keeps together the Parts of the Earth ; from this Ex- 
periment compar’d with what has been faid in the 
lranihtions above-mention’d, it will appear that the 
Earth cannot preferve its Figure, unlefs it be an oblate 
bpheroid. 
VI. Some Experiments concerning the Cohefion 
°f Lead , by the fame . 
H AVING, on Thurfday the 2 9th of April JafL. 
made mention of fome Experiments, concerning 
the Cohefion of two Balls of Lead, applied together in 
a fmall Part of their Surface (fo as to require a Weight 
rar greater than what will overcome the Preffure of 
the Atmofphere, tofeparate them) made by Mr. Trie - 
vall^ at NewcaJUe, and at Edinburgh } 1 made the fol- 
lowing Experiment to the fame Purpofe, before the 
Koyal Society . 
I took the Leaden Balls A and B ( Fie . i.) the firft 
weighing one Pound, and the other two Pounds- 
and having from each of them cut off a Segment of 
about i Inch in Diameter, I prefs’d them together 
with my Hand, with a little Twift, to bring the flat 
Parts to touch as well as I cou’d. The Balls duck fo 
tait, that when the Hand H, by means of a String fuf- 
tain d the upper Ball A, the lower one B (by reafon 
of its Con tad at C) was ftiftain’d, tho’ loaded with the 
Scale 
