French physicist who determined the speed of light and showed that it travels slower in water than in air; invented the Foucault pendulum and the gyroscope (1819-1868)
[ Syn: foucault , jean bernard leon foucault ]
French physicist who determined the speed of light and showed that it travels slower in water than in air; invented the Foucault pendulum and the gyroscope (1819-1868)
[ Syn: foucault , jean bernard leon foucault ]