motograph

名词 n.
中文释义

英文释义

名词 n.
  1. 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. historical

词形变化

motographs plural

词源

From moto- + -graph.
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