Jean-Daniel Colladon
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Jean-Daniel Colladon (born on 15 December 1802 in Geneva and died on 30 June 1893) was a Swiss physicist. He studied law but then worked in the labs of Ampère and Fourier. He received an Académie des Sciences award with his friend Charles Sturm for their measurement of the speed of sound in water in Lake Geneva in 1826. He then became professor of mechanics at Ecole Centrale Paris in 1829. He returned to Switzerland in 1839 and organised the gas lighting of Geneva and Naples.[1]