| The revolutionary Co-Axial Escapement, used in conjunction with the OMEGA free sprung-balance without index, maintains isochronism over longer periods. |
| Swiss chronometer-maker, inventor of the spherical balance-spring, with which he did research on isochronism. |
| By subsequent experiment he verified the law, and the isochronism of the pendulum was discovered. |
| The physicist and astronomer Galilee would have had observed a swinging chandelier in the Pise cathedral that gave him the beginnings of its theory on pendulums oscillations isochronism. |
| The principle of the isochronism of a balance spring was discovered by Hooke, and first applied to a watch by Tompion. |
| A departure from the law of isochronism may then be expected to develop itself. |
