Edison's phonometer

Edison's phonometer

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Credit: Universal History Archive/UIG/SCIENCE PHOTO LIBRARY

Caption: Edison's phonometer which used the energy generated by speech to drive a flywheel. He claimed the power could be used to drill a hole in a wooden wall. From ''La Nature'', Paris, 1878.

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Keywords: 1870s, 19th century, flywheel, france, la nature, paris, phonometer, physical, physics, sound, speech, thomas edison

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