[ ] 
was fet a going again, as before. After this N° i. 
flopped a fecond time, and the Vibrations continued 
to decreafe till the Pendulum was almoft at Reft. It 
afterwards increafed a fmall matter, but not fuffid- 
ently to fet the Work agoing. But N® 2. continued 
going, its Pendulum defcribing an Arch of about 
three Degrees. 
Finding them to ad thus mutually and alternately 
upon each other, 1 fet them both a going a fecond 
time, and made the Pendulums deferibe as large 
Arches as the Cafes would permit. During this Ex- 
periment, as in the former, I fometimes found the 
one, and at other times the contrary Pendulum to 
make the largeft Vibrations. But as they had fo 
large a Quantity of Motion given them at firft, neither 
of them loft fo much during the Period it was aded 
upon by the other, as to have its Work ftopped, but 
both contiuned going for feveral Days witlmut vary- 
ing one Second from each other , though when at a 
Diftance, as was before obferyed, they varied one 
Minute 36 Seconds in 24 Hours. Whilft they con- 
tinued thus going together, I compared them with a 
third Clock, and found that N® i. went one Minute 
17 Seconds fafter, and N°2. 19 Seconds flower, than 
they did when placed at a Diftance, fo as to have no 
Influence upon each other. 
Upon altering the Lengths of the Pendulums, I 
found the Period in which their Motions increafed 
and decreafed, by their mutual Adion upon each 
other, was changed j and would be prolonged as the 
Pendulums came nearer to an Equality, which from 
the Nature of the Adion it was reafonable to exped 
it would. This difeovers the Reafon why the Pen- 
dulum 
