Bausophon Model No. 6a Carbon Hearing Aid The Bausophon Model No. 6a carbon hearing aid was made by Bausophon Gesellschaft M. B. H. of Berlin, Germany sometime around 1930. The complete unit including the battery weighed 11.8 oz. (8.9 oz without the battery) and stood 7⅛" tall. The particular hearing aid the Museum has looks like it was never used. It is still new in the box. |  | Click picture for larger view | | |   | | | |
| Close-up of the front of the carbon microphone of the Bausophon Model No. 6a carbon hearing aid showing the pattern in the mic grill. The microphone measured 2½" in diameter by 1" thick.
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| The back of the Bausophon Model No. 6a carbon hearing aid showing the 6-position volume control lever on the back of the carbon microphone. 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. The microphone attached to the battery compartment by pushing the chrome stubs into the bottom of the microphone. |  | Click picture for larger view | | | |
| Close up of the front of the Bausophon Model No. 6a carbon hearing aid earphone. There are two holes in the sides for fastening a headband to this earphone. The earphone measured 2⅛" in diameter by 11/16" thick. On the front of the earphone is engraved "Bausophon-Gesellschaft M. B. H. Berlin" |  | Click picture for larger view | | | |
| View of the back of the Bausophon Model No. 6a carbon hearing aid earphone showing the on-off switch (top center) in the "on" or "E" (up) position. The "off" position is labeled "A". Engraved on the back is the words "Bausophon No. 6a". |  | Click picture for larger view | | | |
| View of the earphone and headband of the Bausophon Model No. 6a carbon hearing aid. The headband folded in half for easy carrying and storage. |  | Click picture for larger view | | | |
| Bottom view of the battery case of the Bausophon Model No. 6a carbon hearing aid showing the fold-down battery door in the open position. The Bausophon Model No. 6a 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 Ardente No. 77 battery. |  | Click picture for larger view | | | |
| The box the Bausophon Model No. 6a carbon hearing aid came in. It measured 9¾" x 3" x 1¼".
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