motograph Englisch

Bedeutung motograph Bedeutung

Was beudeutet auf Englisch motograph?

motograph noun

— (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.

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