isochronism

The experimental verification of this fact led him to the important discovery of the isochronism of the pendulum.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various

The isochronism of the vibrations of the pendulum inferred from this observation was not published or put to practical application in clocks for nearly sixty years afterward.

From Inventions in the Century by William Henry Doolittle

Adjusted to isochronism indicates that the watch functions uniformly during the entire twenty-four hours running.

From Rules and Practice for Adjusting Watches by Walter J. Kleinlein

And it was not until the close of the year 1750 that Pierre Le Roy and Ferdinand Berthoud studied the conditions of isochronism pertaining to the spiral.

From Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology by Anonymous

In order to produce a note, the succession of shocks must not deviate much from isochronism.

From Scientific American Supplement, No. 401, September 8, 1883 by Various