Teutonophone 3 Carbon Hearing Aid Teutonophone did not give model numbers to their hearing aids so I have put the number "3" on this one to distinguish if from the other two in the museum. Teutonophone, Inc. (established in New York city in 1929) changed its name to Trutonophone, Inc. in June of 1935 because of anti-German sentiment. Later? they just used T Inc. on their hearing aids as is shown on the back of this microphone. This hearing aid was likely produced around 1936 or 1937 as the box it came in shows their address as 5th Avenue, NY where they moved in 1936. |  | Click picture for larger view | | |  | | | |
| Front view of the Teutonophone "3" carbon microphone. This microphone grill consisted of 3 concentric circles and a hole in the center. The outside half of the microphone face has 3 circular grooves. The microphone is 2½" (6.4 cm) in diameter and ⅝" (1.6 cm) thick.
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| Rear view of the Teuronophone "3" microphone. The pocket clip extends down the center of the back. The tip of the pocket clip covers most of the manufacturer's information.
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| Close-up of the bottom center of the Teutonophone "3" showing the manufacturer's logo inside the diamond. It consists of a hollow T with Inc. inset in a circle. Teutonophone changed the name of the company to Trutonophone and then later to just "T Inc." so we know this is one of their later hearing aids. |  | Click picture for larger view | | | |
| Bottom side view of the Teutonophone "3" microphone showing the two sockets for connecting to the battery box "pins". |  | Click picture for larger view | | | |
| The Teutonophone "3" microphone connected directly to the battery box via the two extended "pins". The were held there by friction. |  | Click picture for larger view | | | |
| Close-up of the top front side of the battery box showing the most unusual built-in sliding volume control. Volume could be set from 1 to 5.
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| Front view of the Teutonophone "3" earphone. The earphone was normally attached to a headband (missing). The earphone was 2⅛" (5.4 cm) in diameter and ¾" (1.9 cm) thick. |  | Click picture for larger view | | | |
| Rear view of the Teutonophone "3" earphone. The inscription reads, "Teutonophone" and below it, "Reg. U.S. Pat. Office".
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| Bottom side view of the Teutonophone "3" earphone showing the sockets for the pins on the end of the earphone cord.
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| The two plugs to plug the earphone to the microphone. The plug on the left is from the microphone. Notice the on/off slider switch on the top of the plug (left side) on the end of the earphone cord. Unlike the plugs of today, each piece had one plug and one socket for the matching pin of the other piece. |  | Click picture for larger view | | | |
| The two plugs looked like this when they were plugged together. |  | Click picture for larger view | | | |
| The inside of the battery compartment. The battery's spring contacts pushed against the spring contacts at the top of the battery case. The hinged lid is at the bottom of the battery case. |  | Click picture for larger view | | | |
| Outside view of the bottom of the battery case of the Teutonophone "3" showing the latch so the battery can't push the bottom open and fall out.
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| The Ardente No. 99 hearing aid battery is the right size and voltage to fit the Teutonophone "3" carbon hearing aid battery case. |  | Click picture for larger view | | | |
| The Teutonophone "3" in its shipping box. The box measures 8⅛" (20.5 cm) x 2⅝" (9.2 cm) x 2⅜" (6.0 cm) high. |  | Click picture for larger view | | | |
| The inscription in the bottom right corner of the top of the box. |  | Click picture for larger view | | | |
| Outside view of the shipping box for the Teutonophone "3" carbon hearing aid.
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