motograph (English, noun)
expansion: motograph (plural motographs)
Senses:
glosses: 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.
tags: historical
Forms:
form: motographs
tags: plural