Take this for a spin...

In 1851, when French physicist Léon Foucault performed his pendulum experiment in Paris, he became the first to prove what many scientists of his day already suspected - that the Earth spins on an axis. He conducted his first experiments 170 years ago, in early January 1851, with a relatively small prototype in the cellar of his home. Just a month later, Foucault performed his most famous pendulum demonstration, using a 28-kilogram spherical weight attached to a 67-metre wire, which was hung from the dome of the Panthéon, a Parisian monument.
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