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). Timing receipt of sound of a bell rung under water . Engraving from ''The Forces of Nature'' by Amedee Guillemin, London, 1873.

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Keywords: 19th, boat, century, night, person, physics, scientist, sound, swiss, velocity