PHONAUTOGRAPH

Etymology

Noun

phonautograph (plural phonautographs)

(historical) A device for recording sound vibrations in a visible form.

Source: Wiktionary

Pho*nau"to*graph, n. Etym: [Phono- + Gr. -graph.] (Physics)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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