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Léon Scott patented his own invention (n°31470) under the name "phonautographe" on March 25, 1857.
The scientific principles of "phonautographie" was sent under sealed letter to Académie des Sciences on January 26, 1857 as an evidence of his invention.
Conceived as a stenographic device, the "phonautographe" recorded sound through a horn that focused the sound waves onto a membrane to which a wild boar's bristle was attached, causing the bristle to move and enabling it to inscribe the sound onto a lamp-blackened glass plate, later replaced by a lamp-blackened paper mounted on a drum or cylinder.
This device was not meant to, and could not play back recorded sound. It simply traced a visual representation of the sound waves that hit the bristle. It was not until 2008 that researches were able to re-create the sound waves that would have been used to trace the pattern in the soot.
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