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

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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