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The audiphone was an early hearing-aid invented by Rhodes and improved in 1880 by Colladon. It consisted of a thin sheet of hard ebonite rubber or cardboard placed next to the teeth through which and other bones sound vibrations are conveyed to the auditory nerve.
 Research Audiphone
Ebonite is a hard product obtained by fully vulcanising rubber with more than 20 percent of its weight of sulphur. Ebonite is very resistant to corrosion and as an excellent insulator was employed in the electrical industry.
Research Ebonite
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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