Foucault-jean-bernard-leon meaning

fo͝o-kō'
French physicist who estimated the speed of light, used a pendulum to demonstrate the rotation of the earth, and invented the gyroscope.
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French physicist who determined that light travels more slowly in water than in air, confirming predictions made by the wave theory of light. In 1850 Foucault also measured the absolute velocity of light. In 1851, by using a type of pendulum that is now named after him, Foucault demonstrated the rotation of the Earth, and in 1852 perfected a gyroscope for the same purpose.
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