isochronal

His enquiries into evolutes enabled him to prove that the evolute of a cycloid was an equal cycloid, and by utilizing this property he constructed the isochronal pendulum generally known as the cycloidal pendulum.

It is often supposed that hairsprings having exactly even coils are correct for close position and isochronal rating.

In 1639 Galileo, then old and blind, dictated to his son one of his books in which he discussed the isochronal properties of oscillating bodies, and their adaptation as time measures.

He chewed slowly, conscientiously and continuously on tobacco which bulged in his cheek; his jaws, moving as steadily as a pendulum swings, seemed to set the time for the isochronal whistle-blast.

There was something indescribably grim and bodeful in those isochronal batterings of the solid ground.