isochronous

Musical tones are produced by isochronous (equal-timed) vibrations of the vocal organs continued for some length of time.

Or again by suitable arrangements the bob may be made to move in certain curves so as to be isochronous.

This is what is called isochronous vibration—the passing through unequal arcs in equal periods of time.

Hence it is that the vibrations of unequal weights are isochronous when hung on strings of equal lengths.

Galileo published his discovery of the isochronous property of the pendulum in 1639.