Acousticon Model "A" Carbon Hearing Aid This early model Acousticon carbon aid was manufactured between 1905 and 1910 by the Hutchison Acoustic Company (1904), which later became the General Acoustic Company
(1906). This hearing aid consists of a round carbon microphone (with no volume control), and an earphone with a detachable metal headband and an on-off switch on the back. The model shown at the right is signed General Acoustic Co. and was made sometime after 1906. |  | Click picture for larger view | | |  | | | |
| The picture on the right shows the Acousticon Model A with the battery attached.
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| Another view of the complete Acousticon Model "A" hooked up to its battery. |  | Click picture for larger view | | | |
| Close-up of the Acousticon Model "A" earphone. |  | Click picture for larger view | | | |
| The Acousticon Model "A" earphone showing the headband from the front. |  | Click picture for larger view | | | |
| View of the Acousticon Model "A" earphone and headband from the back showing the on/off switch on the right side. (See larger view.) |  | Click picture for larger view | | | |
| Rear view of the Acousticon Model "A" carbon microphone. |  | Click picture for larger view | | | |
| The Acousticon Model "A" carrying case. |  | Click picture for larger view | | | |
| This battery, which is an Acousticon No. 5 (3 volt) was made by the Dictograph Corporation, the name of the company which produced Acousticon Hearing Aids after 1918.
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