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V. An Account of the Influence which two 
Pendulum Clocks were obferved to have 
upon each otheVy by Mr. John Ellicott, 
F. R. S. 
T he two Clocks upon which the following 
Obfer vat ions were made, being defigned for 
Regulators, particular Care was taken to have every 
Part made with all poffible Exaftnefs : The two Pen- 
dulums were hung in a manner different from what 
is ufual ; and fo difpofed, that the Wheels might a£t 
upon them with more Advantage. Upon Trial they 
were found not only to move with greater Freedom 
than common, but an heavier Pendulum was kept 
in Motion by a fmaller Weight. They were in every 
refped made as near alike as poffible. The Ball of 
each of the Pendulums weighed above 2 3 fc j and 
required to be moved about 1° 5' from the Perpen- 
dicular, before the Teeth of the fwing Wheel would 
fcape free of the Pallets? that is, before the Clocks 
would be fet a going. The Weight to each was 3 lb, 
which would caufe either of the Pendulums in their 
Vibrations to defcribe an Arch of 3°. The two 
Clocks were each in Cafes, which fhut very 
clofe, and placed Sideways to one another, fo near 
that when the Pendulums were at Reft, they were 
little more than about two Feet afunder. The odd 
^h^enomena obferved in them were thefe : In lefs 
than two Hours after they were fet a going, one of 
them (which I call N° i.) was found to flop i and 
when fet a going again, (as it was feveral times) 
would 
