Experiment to measure the velocity of sound in water. These measurements were made in 1841 on Lake Geneva by Jean Daniel Colladon (1802-1893) and Charles Sturm (1803-1855). Striking a bell under water with simultaneous flash of light. Engraving from ''The Forces of Nature'' by Amedee Guillemin, London, 1873.
July 24th, 2016
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