How did Faraday demonstrate electromagnetic rotation in 1821?

In 1821, Michael Faraday demonstrated electromagnetic rotation by building upon the discovery that a current-carrying wire produces a circular magnetic field around it.1

Faraday reasoned that if a magnetic pole could be isolated, it should move continuously in a circle around a wire carrying an electric current. Using his laboratory skills, he constructed an apparatus that successfully confirmed this hypothesis. This device, which converted electrical energy into mechanical energy, is recognized as the first electric motor.12