C >5* ] 
Pertdulum is moving ; and which, by the Interpo- 
litioii of any folid Body, will be communicated to 
the other Clock, whofe Pendulum was left at Reft. 
The only Objedion to this, I conceive, is the differ- 
ent Effeds which the two Pendulums feemed to have 
upon each other. But this I hope to explain to Satif- 
fadion. 
For, notwithftanding thefe different Effeds, I foon 
found, by fevetal Experiments, that the two Clocks 
mutually affeded each other, and in the fame Man- 
ner, though not with equal Force ; and that the 
Varieties obfcrved in their Adions upon each other, 
arofe from the unequal Lengths of their Pendulums 
only. 
For, upon moving one of the Clocks to another 
Part of the Room, and fetting them both a going, I 
found that N° 2. gained of N« i. about one Minute 
36 Seconds in 24 Hours. Then fixing both againft 
the Rail, as at firft, 1 fet them a going, and made the 
Pendulums to vibrate about four Degrees; but I Toon 
obferved that of N° i, to increafe, and that of N° 2. 
to decreafe j and in a ftiort time it did not defcribe 
an Arch large enough to keep the Wheels in Mo- 
tion. In a little time after it began to increafe again, 
and in a few Minutes it defcribed an Arch of two 
Degrees, and the Clock went. Its. Vibrations con- 
tinued to increafe for a confiderable time, but it 
never vibrated four Degrees, as when firft fet a going. 
Whilft the Vibrations of No 2. increafed, thofe of 
No I. decreafed, till the Clock flopped, and the Pen- 
dulum did not defcribe an Arch of more than one 
Degree 30 Minutes. It then began to increafe again, 
and N° 2. decreafed, and flopped a fecond time, but 
was 
