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 the calculation of the sound speed in water. He became then professor at Ecole Centrale Paris in 1829. He came back in Switzerland in 1839 and organised the gas lighting of Geneva and Naples.