(Jean Bernard) Leon Foucault (1819-1860) French physicist. Measured velocity of light: Proved rotation of Earth on its axis with Foucault's pendulum,

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(Jean Bernard) Leon Foucault (1819-1860) French physicist. Measured velocity of light: Proved rotation of Earth on its axis with Foucault's pendulum, 1851. Invented Gyroscope (1857): Improved the reflecting telescope. Wood engraving.

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Keywords: 1819-1860, 1851, 1857, axis, bernard, earth, engraving, foucault, french, gyroscope, improved, invented, jean, leon, light, measured, pendulum, physicist, physics, proved, reflecting, rotation, science, telescope, velocity, wood