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  • Webster's Revised Unabridged Dictionary
    • n Motograph (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.
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Century Dictionary and Cyclopedia
    • n motograph A form of telegraph-or telephone-receiver, invented by Edison, depending for its action on the variation of the friction between two conductors in relative motion, when a current of electricity is passed from one to the other across the surface of contact. A revolving drum is interposed in the circuit, one of the electrical connections being made through a movable terminal in contact with the surface of the drum. This contact-piece is connected to a recording lever or to a telephonic diaphragm, and, in consequence of the variations of the friction produced by the electric currents, causes the lever to record, or the diaphragm to repeat, the message.
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Chambers's Twentieth Century Dictionary
    • n Motograph mō′to-graf a device of Edison's, used as a telephone receiver, &c., by which the variation of the friction between two conductors in relative motion is diminished periodically by the passage of a current of electricity from one to the other across the surface of contact
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Webster's Revised Unabridged Dictionary
L. movere, motum, to move + -graph,
Chambers's Twentieth Century Dictionary
L. motus, motion, Gr. graphein, to write.


In literature:

He made a similar agreement for the same sum offered him for the patent of the electro-motograph.
"The Age of Invention" by Holland Thompson