Pendulum Contained by Cycloid moves along Cycloidal Path/Historical Note

Historical Note on Pendulum Contained by Cycloid moves along Cycloidal Path
The discovery that a Pendulum Contained by Cycloid moves along Cycloidal Path was made by during his work on developing a reliable and accurate pendulum clock.

Unfortunately, the technique proved impractical, as the energy losses caused by the mechanics of the system compromise the pendulum's ability to swing reliably for a practical length of time.