Unknown 2 Carbon Hearing Aid This unknown make of carbon hearing aid was made around 1930, probably by, or for, a British company as it came from the United Kingdom. The overall height of this hearing aid was 7⅛". The battery compartment itself measured 3¾" x 2⅝" x 1". The whole hearing aid (without the battery) weighed 7½ oz. |  | Click picture for larger view | | |  | | | |
| Front view of the carbon microphone showing the design of the microphone grill. The microphone measured 2½" in diameter and ⅝" thick.
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| Rear view of the carbon microphone showing the 6-position volume control number 1 through 6. It is shown in the "1" position. The ring at the top is for threading a ribbon through to make a lanyard for wearing it around the person's neck.
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| Front view of the on-off switch. It is labeled "on" (left) and "off" (right). This switch is about 1/3 of the way along the cord joining the microphone to the ear piece (receiver). This switch is ⅞" in diameter.
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| The receiver had a wire ear hook to hold it in place. The stock ear mold could screw out to replace it with one of a different size.
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| Close-up view of the receiver showing the volume adjustment that could be made by turning the two halves of the receiver up to about ½" (lower center).
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| Bottom view of the battery container. The clip (top) holds the bottom from swinging down.
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| The battery compartment showing the battery door swung down. This hearing aid took a 4.5 volt battery that had flat brass springs on the top to engage the corresponding brass springs in the top of the battery compartment. This was common with British-made carbon hearing aids of this era. The Ardente Hearing Aid Battery shows these springs. This battery fits this hearing aid.
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