Wave-siren by Karl Rudolph Koenig (1832–1901) German businessman, instrument maker and physicist, primarily concerned with acoustic phenomena. Inventions of the nineteenth century. Old 19th century engraved illustration from El Mundo Ilustrado 1879

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Size: 4781px × 5315px
Photo credit: © Old Books Images / Alamy / Afripics
License: Licensed
Model Released: No

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