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

Expugnator Carbon Hearing Aid

The Expugnator carbon hearing aid was manufactured by Expugnator Gmbh, Duderstadt, Germany around 1917.

The complete hearing aid without  battery weighed 6.6 oz. (188 g).

The overall height of the Expugnator was 9⅛" (23.1 cm). The battery compartment was 3⅝" x 1⅞" x 1" (9.2 x 4.7 x 2.5 cm).

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Front view of the Expugnator double carbon microphone. Each microphone was 2⅛" (5.4 cm) in diameter and 11/16" (1.8 cm) thick.

The double carbon microphones lowered the resistance in the circuit allowing more current to flow, thus giving more volume than a single carbon microphone would.

Note that carbon microphones did not work when laying down. You had to keep the vertical.

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Rear view of the Expugnator  carbon microphones. The identical microphones are held together by a plate and 4 screws (center).

 


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Close-up of the upper back of the top Expugnator  microphone showing the name of the manufacturer (Expugnator Gmbh) and the location of the factory (Duderstadt) in Germany.

 

 

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Close-up of the bottom edge of the lower microphone of the Expugnator  carbon hearing aid showing how the prongs on the battery case fit into holes in the bottom edge of the microphone.

 


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Close-up of the bottom edge of the lower microphone of the Expugnator  carbon hearing aid showing the battery compartment connected to the microphones.

 


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Top view of the separate on-off switch of the Expugnator  carbon hearing aid. At the top is "E" (German for "ein" or "on") and below the switch is an "A" (German for "aus" or "off").
 


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Side view of the on-off switch of the Expugnator carbon hearing aid. The switch housing was 1⅛" in diameter by 7/16" thick (2.7 x 1.1 cm).

 


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Side view of the earphone of the Expugnator carbon hearing aid. This earphone shape is made in the German style of the day, being quite thick in the body and because of the all-metal construction, it was quite heavy for it's size.

 

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Rear view of the Expugnator carbon hearing aid's earphone showing the flexible ear hook to hold the earphone to your ear. The ear hook is not a solid piece of wire, but a finely-wound spring so it would fit around any sized ear.

 

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Top view of the Expugnator  carbon hearing aid's earphone showing the black hard rubber ear tip.

 

 

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Close-up of the Expugnator carbon hearing aid earphone showing how the ear tip snapped into the hole on the earphone. It could easily be snapped off for cleaning.

 

 

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Bottom view of the battery case of the Expugnator carbon hearing aid showing the battery door latched closed.

 

 

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Bottom view of the battery case of the Expugnator carbon hearing aid showing the battery door open.

This hearing aid used a 3-volt carbon zinc battery such as the Teutonophone No. 1 carbon-zinc battery.

 

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The Expugnator in its carrying case.

 

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The carrying case for the Expugnator carbon hearing aid. The carrying case measured 12" x 2⅝" x 1¼" thick. (30.3 x 6.5 x 3.2 cm).


 


 

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