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The first public exhibition of a Foucault pendulum took place in February 1851 in the Meridian Room of the Paris Observatory. A few weeks later, Foucault made his most famous pendulum when he suspended a 28 kg bob with a 67 metre wire from the dome of the Panthéon, Paris. The plane of the pendulum’s swing rotated clockwise 11° per hour, making a full circle in 32.7 hours.
By the mid 19th century, scientist had long known that the Earth rotates, but they couldn’t demonstrate it. In 1851, Leon Foucault put a 28 kilogram bob from the dome of the Parthenon. The Parthenon now houses a replica showing that the Earth rotates under it when it swings.
Linked themes: Geography
In the Pantheon of Paris, the pendulum of Foucault was demonstrated.