[ *«<5 ] 
over a Pulley at the Top of a Frame of Wood, fo as 
to be moved up and down. From the Board hung fix 
fine white Threads about eighteen Inches long, fixed 
by a little Cement at equal Diftances from each other. 
The Board being let down till the Ends of the 
Threads were about an Inch diftant from the eledlric 
Cake, which was dircdly under, and had the ivory 
Ball on its Centre } the Threads all approached to- 
wards the Centre of the Cake, both when the Ball 
was in the Centre, and when taketi away, keeping an 
equal Diftance from the Centre, and from one an- 
other, as long as a Packthread joined the Circle of 
Board and the Frame to keep it fteadyj and upon 
removing the Ball out of the Centre towards the 
Circumference, the Figure lengthen'd, the Threads 
next the Ball advancing nearer the Circumference i 
when the Ball was placed at about an Inch Diftance 
from the Circumference, the Thread that was before 
neareft the Circumference, whipp’d between the Ball 
and the Centre, fo as to be almoft in the fame Plane 
with its two neighbouring Threads, the figure form’d 
by the Extremities refcmbling an Ellipfe with one 
End cut off": But when inftead of the Packthread that 
join’d the Board to the Frame, a blue filk Line was 
tied in the fame manner in all refpeds, the Threads, 
inftead of coming towards the Centre, all flew away 
at a great Diftance from the Cake, and from one 
another. 
It ought to be obferved in the Experiments of the 
circular Motion of the pendulous Body, that Mr. 
Wheler^ Hand feem’d as fteady as poflible, except in 
the firft Experiment, when a little Trembling appear’d 5 
Mr. George Grakam taking a very good Method to 
obfeivc 
