Motograph

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Motograph \Mo"to*graph\, n. [L. movere, motum, to move +
     -graph.] (Elec.)
     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.
     [obsolescent] -- {Mo`to*graph"ic}, a.
     [Webster 1913 Suppl.]