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.

The result is a powered double pendulum. There aren’t many build details here, but the device is simple enough that we can deduce how it works from the demonstration video. It’s broken into ...