phonautograph
/fə(ʊ)ˈnɔːtəɡrɑːf/ /fə(ʊ)ˈnɔːtəɡraf/(also phonoautograph) Now historical
noun
An apparatus for automatically recording sound vibrations, incorporating a membrane which vibrates in response to sound waves and has a point attached which makes a tracing on a revolving cylinder.
Origin
Mid 19th century; earliest use found in The Times. From French phonautographe from phono- + auto- + -graphe.
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