Léon Foucault (1819–1868)
Born 1819 CE, died 1868 CE.
Jean Bernard Léon Foucault (UK: , US: ; French: [ʒɑ̃ bɛʁnaʁ leɔ̃ fuko]; 18 September 1819 – 11 February 1868) was a French physicist who invented the Foucault pendulum, a device demonstrating the effect of Earth's rotation. He also made an early measurement of the speed of light, discovered eddy currents, and is credited with naming the gyroscope.
Text from the Wikipedia article Léon_Foucault, licensed CC BY-SA 4.0.