motograph

English

Etymology

moto- +‎ -graph

Noun

motograph (plural motographs)

(historical) A device used in the making of a loud-speaking telephone, depending on the fact that the friction between a metallic point and a moving cylinder of moistened chalk, or a moving slip of paper, on which it rests is diminished by the passage of a current between the point and the moving surface.

Anagrams

photogram, tomograph

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