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Harper's Encyclopedia of United States History (ed. Benson Lossing) 2 0 Browse Search
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Harper's Encyclopedia of United States History (ed. Benson Lossing), Audiphone, (search)
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.