Siren, invented by Charles Cagniard de la Tour (1777-1859), French engineer and physicist. Engraving, London, 1874.

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
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Keywords: 19th, cagniard, century, charles, de, engineer, engraving, french, invention, la, london, physicist, physics, siren, sound, tour