Bible Dictionaries
Motograph
Webster's Dictionary
(n.) A device utilized 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.
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Bibliography Information
Webster, Noah. Entry for 'Motograph'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/m/motograph.html. 1828.