Jean Bernard Léon [Leon] Foucault (18 September 1819 – 11 February 1868) was a French physicist best known for his demonstration 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, discovered eddy currents, and is credited with naming the gyroscope. From the Book Les merveilles de la science, ou Description populaire des inventions modernes [The Wonders of Science, or Popular Description of Modern Inventions] by Figuier, Louis, 1819-1894 Published in Paris 1867
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