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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