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Léon Foucault


 

Jean Bernard Léon Foucault (18 September 181911 February 1868) was a French physicist best known for the invention of the Foucault pendulum, a device demonstrating the effect of the Earth's rotation. He also made an early measurement of the speed of light, invented the gyroscope, and discovered eddy currents. The Foucault crater on the Moon is named after him.

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