A portable instrument, so small that it could be carried in a woman’s handbag, was devised to enable deaf people to hear through their teeth. Speech or music was transmitted by means of a gramophone record or a microphone through an electrical apparatus, which could be plugged in to an ordinary house-lighting circuit. The sound impulses were conveyed to small pads, and when these were gently pressed against the teeth of a person who was otherwise stone deaf, he was able to “hear” vibrations and understand them.
Source: The World’s News (Sydney, NSW: 1901-1955), Wed 20 Feb 1935
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