phonophotography
/ˌfəʊnə(ʊ)fəˈtɒɡrəfi/Now chiefly historical
noun
The photographic recording of sound waves (especially those produced by speech or singing), by means of an apparatus which responds to sound vibration whilst simultaneously projecting a ray of light on to a moving photographic film.
Origin
1920s; earliest use found in Science. From phono- + photography.
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