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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 phonautograph
 聲波振記器

From: Webster's Revised Unabridged Dictionary (1913)

 Pho·nau·to·graph n.  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 cylinder or plate.
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