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

Great London (2) Carbon Hearing Aid

The Great London (2) carbon hearing aid was manufactured by The Great London Hearing Aid Company of Toronto, Ontario, Canada probably around 1935.

The complete hearing aid with  battery weighed 1 lb 4 oz. (567 g).

Note that the two obvious differences between this model and the previous one is that both the microphone and battery use plugs. They are not hard-wired. Also, the finish is smooth. It is not a crackle finish.

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Great London advertised in newspapers from 1931 to 1941 so you can assume those were the years they were in operation.

For example, to the right is an ad that appeared in the Winnipeg Free Press of Winnipeg, Manitoba on October 4, 1938 (page 2).

 

 

 
Front view of the Great London (2) carbon hearing aid carbon microphone. The microphone was 2⅜" (6.0 cm) in diameter and 13/16" (2.1 cm) thick.

Stamped around the rim are the words "Great London Hearing Aid".

Note that carbon microphones did not work when laying down. You had to keep them at an angle or vertical.

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Rear view of the Great London (2) carbon hearing aid  carbon microphone. The leather "button hole" could be buttoned to any button on your clothes, or you could run a lanyard through it and wear it around your neck.

Near the bottom are the words "Made in Canada".

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Side view of the Great London (2) carbon hearing aid  carbon microphone showing the two jacks for plugging in the receiver or earphone plug. The holes were of different sizes so you couldn't plug it in the wrong way.


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The receiver/earphone cord and plug (left) plugged directly into the top side of the microphone of the Great London (2) carbon hearing aid.

 

 

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The carbon microphone of the earphone of the Great London (2) carbon hearing aid could plug directly into the battery as shown.

 

 

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Alternately, the microphone could be plugged into the battery via an extension cord so the battery could be in a pocket and the microphone attached to a button on your coat or shirt.

 

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View of the microphone extension cord of the Great London (2) carbon hearing aid.

This extension cord was 14½" (36.8 cm) long.

 

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Front view of the Great London (2) carbon hearing aid showing the battery extension cord (right) in use.

 

 

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Front view of the Great London (2) carbon hearing aid showing the setup without using the battery extension cord. The battery plugged directly into the microphone.

Note the earphone is shown here, in contrast to the receiver in the above picture.

 

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Top view of the separate on-off switch/volume control of the Great London (2) carbon hearing aid. Stamped in the brass (under the paint) are the words "off" at one end, "loud" at the other and about half way across is the word "soft".

The volume control measured 1⅛" in diameter x 7/16" thick (2.9 x 1.1 cm).
 


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Front view of the earphone of the Great London (2) carbon hearing aid.

The earphone measured 2 1/16" in diameter x 9/16" thick (5.2 x 1.4 cm).

You had your choice--wear the earphone on a headband (not shown) or wear the receiver in your ear.

 

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Rear view of the earphone of the Great London (2) carbon hearing aid. At the top is the word "London" and below it is "XXX".

 

 

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Front view of the receiver of the Great London (2) carbon hearing aid. The black rubber ear tip screwed off for cleaning. It also could hold a flexible ear hook in place (not shown).

The receiver measured 1⅛" in diameter x 9/16" thick (2.9 x 1.4 cm).

 

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Rear view of the Great London (2) carbon hearing aid's earphone. Note the "London" stamped into the back (left).

 

 

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The Great London (2) carbon hearing aid in its carrying case. The microphone stuck through a large hole  in the case so you could use it while it was in its case.

This hearing aid used either a 3-volt (2 cell) carbon zinc London 2 battery, or, for more power (volume), a 4.5 volt (3 cell) carbon-zinc London 5?  battery.

 

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Top view of the leather carrying case for the Great London (2) carbon hearing aid with the microphone showing through the hole in the case.

 The carrying case measured 7¼" x 3¼" x 3¼". (18.5 x 8.3 x 8.3 cm).


 


 

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