HearAll Carbon Hearing Aid
The HearAll carbon hearing aid was made in Germany, probably somewhere around 1930.
Exactly who the manufacturer was is unknown.
The complete unit including the battery weighed 14 oz. and stood 7⅛"
tall.
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Close-up of the front of the HearAll carbon microphone showing
the pattern in the mic grill. The microphone measured 2½" in diameter by
¾"
thick.
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The back of the HearAll carbon microphone and battery case showing the
microphone attached to the battery compartment. The battery compartment
stubs could be pulled out of the microphone. They are of different sizes
so you couldn't plug them in backwards. The metal bracket with the
hole in it (top center) was for running a lanyard through it to wear
this hearing aid around your neck.
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The plug from the earphone (right) plugged into the socket attached to a
cord from the microphone (left). Note the two red dots near the bottom
center of each piece. You lined them up (dot facing dot) before plugging
them together to ensure the correct polarity since the pins are both the
same size. |
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Close up of the front of the HearAll earphone. There are two holes in
the sides, likely for fastening either a headband or lorgnette handle to
this earphone. The earphone measured 2⅛" in diameter by 11/16" thick. |
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View of the back of the HearAll earphone showing the on-off switch
(top center) in the "on" (up) position. |
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Close-up of the back of the HearAll earphone showing the name
engraved there. The word "Hear" is clear, but exactly what the second
word is is unknown but it looks like it is about 3 letters and ends in
"L", so I suggest the name "Hear All" but I cannot find a hearing aid
manufacturer that used that name. Above the name it reads "Reg. U.S.
Pat." Below the name is the slogan "I Hear All" and at the bottom "Made
in Germany". |
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Bottom view of the battery case showing the fold-down battery door
in the open position.
The HearAll used a 3-volt zinc-carbon battery of the size and style
shown to the left of the battery case. Note that the battery needed
spring-clip terminals to engage the contacts at the top of the battery
case. The battery show here is a
Teutonophone No. 1 Special battery.
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