Tautochrone Problem/Historical Note

Historical Note on Tautochrone Problem
The fact that Cycloid has Tautochrone Property was discovered by in $1658$, during his work on developing a reliable and accurate pendulum clock.

The Tautochrone Problem was also solved independently by in $1823$, using the technique now known as Abel's integral equation.

Also see

 * Brachistochrone Problem/Historical Note