English dictionary
motograph
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
-
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.
Source: webster1913