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The Foucault pendulum is a device that visually demonstrates the rotation of the Earth. His invention is attributed to Jean Bernard Leon Foucault (1819-1868). At first the experiment was carried out in a narrow circle, but so interested L. Bonaparte (later became Napoleon III, the French emperor) that he proposed Foucault to repeat it publicly on a grand scale under the dome of the Pantheon in Paris. This public demonstration, organized in 1851, is usually called Foucault's experience.