old telegraph or telephone receiver
Found on
http://phrontistery.info/m.html
• (n.) 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.
Found on
http://thinkexist.com/dictionary/meaning/motograph/
Mo'to·graph noun [ Latin
movere ,
motum , to move +
-graph .]
(Electricity) 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 ...
Found on
http://www.encyclo.co.uk/webster/M/106
No exact match found.
