Deafness in Disguise

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images, illustrations, advertising pamphlets, trade catalogs, patents, rare books and other items realted to Concealed hearing devices of the 19th and 20th centuries.

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This photograph shows the Rhodes Audiphone in use. The model holds a flexible sheet of vulcanite, adjusted to a convex shape by means of cords, between her teeth. Sound was gathered through the fan area, then traveled via the upper teeth to the inner ear by bone conduction. The cords kept the fan under tension, providing for better vibration. The sound device on the model's lap is a folding "Dentaphone," a similar bone conduction hearing device.

via Las Insolitas Aventuras del Pez.

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