Leon Foucault — French Inventor born on September 18, 1819, died on February 11, 1868
Jean Bernard Léon Foucault 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... (wikipedia)