Deutsche Akustik CII Carbon Hearing Aid This carbon hearing aid is one of the oldest in the Museum. It was manufactured in Germany around 1905 by the Deutsche Akustik Gesellschaft of Berlin. It consists of two carbon microphones in a round metal casing with a 4 step type volume control on the top, and an earphone. The carbon microphones sit horizontally with a slight slope towards the grill opening in the front of the case. This hearing aid is 2½ in. diameter and 2¼ in. height. |  | Click picture for larger view | | |  | | | |
| The picture at the right shows the battery plug (top center), not the earphone plug, which is shown in the top picture.
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| Close-up of the Deutsche Akustik CII carbon hearing aid showing the 4 levels of volume and the switch in the off position. A user could leave the volume set at their favorite level and then turn the hearing aid on or off using the switch on the earphone (see below) rather than turning it off on the hearing aid itself. |  | Click picture for larger view | | | |
| Close-up of the Deutsche Akustik CII carbon hearing aid showing the rear view of the earphone and its slider on/off switch (button on the left) shown in the on position. |  | Click picture for larger view | | | |
| The Deutsche Akustik Model CII was more suited to sitting on a table top than for wearing on the body, even though it has a sturdy metal clip for fastening to a pocket. Although it looks heavy, this hearing aid is surprisingly light at only 160 grams (5.6 ounces). |  | Click picture for larger view | | | |
| The carrying case for the Deutsche Akustik CII carbon hearing aid.
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