The Foucault Pendulum is named for the French physicist Jean Foucault (pronounced "Foo-koh), who first used it in 1851 to demonstrate the rotation of the earth. It was the first satisfactory ...

His first experiments involved driving a simple pendulum with a pulse motor ... Stick around to see a quick video demonstration of the clock with all of its gearing in action.

William Thomson (Lord Kelvin) regularly demonstrated the apparatus using his Jacob militia rifle resting on the pendulum guard. His rifle, still in its case with embossed brass powder horn ...