The phonautograph is the earliest known device for recording sound. Previously, tracings had been obtained of the sound-producing vibratory motions of tuning forks and other objects by physical contact with them, but not of actual sound waves as they propagated through air or other media. Invented by Frenchman Édouard-Léon Scott de Martinville, ...
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http://en.wikipedia.org/wiki/Phonautograph
instrument for recording sound vibrations
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http://phrontistery.info/p.html
• (n.) An instrument by means of which a sound can be made to produce a visible trace or record of itself. It consists essentially of a resonant vessel, usually of paraboloidal form, closed at one end by a flexible membrane. A stylus attached to some point of the membrane records the movements of the latter, as it vibrates, upon a moving cylin...
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http://thinkexist.com/dictionary/meaning/phonautograph/
(from the article `acoustics`) Attempts to record and reproduce sound waves originated with the invention in 1857 of a mechanical sound-recording device called the phonautograph by ...
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http://www.britannica.com/eb/a-z/p/59
<physics> An instrument by means of which a sound can be made to produce a visible trace or record of itself. It consists essentially of a resonant vessel, usually of paraboloidal form, closed at one end by a flexible membrane. A stylus attached to some point of the membrane records the movements of the latter, as it vibrates, upon a moving c...
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http://www.encyclo.co.uk/local/20973
Pho·nau'to·graph noun [
Phono- + Greek ... self +
-graph .]
(Physics) An instrument by means of which a sound can be made to produce a visible trace or record of itself. It consists essentially of a resonant vessel, usually of paraboloidal form, closed at one end by a flexible memb...
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http://www.encyclo.co.uk/webster/P/74
phonautograph, phonautography, phonautographic 1. An apparatus for automatically recording the vibrations of sound, including the voice, by means of a membrane set in vibration by the sound-waves, and having a point attached which makes a tracing upon a revolving cylinder. 2. An instrument where by a sound can be made to produce a visible record o...
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http://www.wordinfo.info/words/index/info/view_unit/262/20
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