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Fizeau–Foucault apparatus may refer to either of two nineteenth-century experiments to measure the speed of light: *
Fizeau's measurement of the speed of light in air From 1848 to 1849, Hippolyte Fizeau used a toothed wheel apparatus to perform absolute measurements of the speed of light in air. Subsequent experiments performed by Marie Alfred Cornu from 1872 to 1876 improved the methodology and made more acc ...
, using a toothed wheel *
Foucault's measurements of the speed of light In 1850, Léon Foucault used a rotating mirror to perform a differential measurement of the speed of light in water versus its speed in air. In 1862, he used a similar apparatus to measure the speed of light in the air. Background In 1834, Cha ...
, using a rotating mirror


See also

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Hippolyte Fizeau Armand Hippolyte Louis Fizeau (; 23 September 1819 – 18 September 1896) was a French physicist who, in 1849, measured the speed of light to within 5% accuracy. In 1851, he measured the speed of light in moving water in an experiment known as t ...
*
Léon Foucault Jean Bernard Léon Foucault (, ; ; 18 September 1819 – 11 February 1868) was a French physicist best known for his demonstration of the Foucault pendulum, a device demonstrating the effect of Earth's rotation. He also made an early measuremen ...
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