The dentaphone : a new scientific invention, which enables the deaf to hear by the sound-vibrations conveyed through the medium of the teeth, and the deaf and dumb to hear and learn to speak.

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The dentaphone : a new scientific invention, which enables the deaf to hear by the sound-vibrations conveyed through the medium of the teeth, and the deaf and dumb to hear and learn to speak. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.