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Harper's Encyclopedia of United States History (ed. Benson Lossing) | 2 | 0 | Browse | Search |
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Audiphone,
An instrument to assist dulness of hearing, invented by R. G. Rhodes, of Chicago, and modified by M. Colladon, of Geneva, in 1880.
It consists of a thin sheet of hard ebonite rubber or card-board, to be placed against the teeth, through which and other bones vibrations are conveyed to the auditory nerve.