Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Carbon Hearing Aids: 1900-1939

Ossicaide "Bona-Caide" Carbon Hearing Aid

The Ossicaide "Bona-Caide" carbon hearing aid was made by Ossicaide Hearing Aids of London, England around 1928.

The Ossicaide "Bona-Caide" (excluding case and battery) weighed just 5½ oz.

This hearing aid, made mostly of polished brass, was quite elegant compared to the mostly black hearing aids of the time.

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Front view of the polished brass microphone of the Ossicaide "Bona-Caide". The microphone was quite small at 1½" in diameter by 1⅜" thick.

 


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Side view of the Ossicaide "Bona-Caide" microphone showing the pocket (or more likely, button hole) clip.

 

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Rear view of the Ossicaide "Bona-Caide" microphone showing the engraved name and the sliding on-off switch (right) in the off position.

 

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The Ossicaide "Bona-Caide" had an elegant polished brass barrel-shaped carbon amplifier that attached directly to the battery.

 

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Bottom view of the Ossicaide "Bona-Caide" carbon amplifier showing the pins marked with a "-" and "+" to show the proper polarity since the pins were the same size and thus could be plugged in "backwards".

 

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The Ossicaide "Bona-Caide" came with a bone conductor transducer attached to a headband. The wearer positioned the transducer on the mastoid bone just behind the ear.

 

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The bone conductor transducer headband was connected to the rest of this hearing aid by these unusual plugs.

 

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The easy way to store the headband in the carrying case was to use a pipe cleaner to compress the headband so it fit in the case.

 

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The inside of the Ossicaide "Bona-Caide" carrying case showing the various components stowed there.

 

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The outside of the original Ossicaide "Bona-Caide" carrying case. There was no name or other identifying marks on this case. It measured 6" long x 3⅝" wide x 1¾" high.

 


 

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