isochronism

If the isochronism is but little impaired, we obtain a note corresponding to the mean interval of the shocks.

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

Dr. Hooke, the inventor of the balance spring, soon discovered it could be manipulated to isochronism, i.e., so arcs of different extent would be formed in equal time.

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

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

We obtain the notes of both circles, one of which is the octave of the other, if there is no isochronism between the shocks.

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