Teutonophone 1 Carbon Hearing Aid Teutonophone did not give model numbers to their hearing aids so I have put the number "1" on this one to distinguish if from the other two in the museum. Teutonophone, Inc. was established in New York city in 1929. This hearing aid was likely produced around 1930 or 1931. The carbon microphone is attached to the top of the battery case. The battery case is 1⅞" wide x 1" thick x 3½" tall. The whole assembly is only 6½" tall. The complete unit including carrying case and battery weighs exactly 1 pound. |  | Click picture for larger view | | |  | | | |
| The picture at the right shows the back of the carbon microphone. The microphone is 2" in diameter and ½" thick.
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| The receiver was held in the ear by an ear hook that fits in a groove around the circumference of the receiver. |  | Click picture for larger view | | | |
| Close-up side view of the ear piece (receiver) showing the volume control. You change the volume by screwing the front of the receiver a bit to the left or right. |  | Click picture for larger view | | | |
| The back of the ear piece (receiver) with the ear hook in place. |  | Click picture for larger view | | | |
| The two plugs to plug the earpiece 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). Unlike the plugs of today, each piece had one plug and one socket for the matching one of the other piece. |  | Click picture for larger view | | | |
| The inside of the battery compartment. The hinged lid is at the bottom of the battery case. |  | Click picture for larger view | | | |
| The Teutonophone No. 1 battery only weighed 3½ oz., and measured 1⅝" by ¾" by 2⅝" high. |  | Click picture for larger view | | | |
| The inside of the Teutonophone "1" carrying case. The carrying case measures 7½" x 2¾" x 3" tall. |  | Click picture for larger view | | | |
| The carrying case for the Teutonophone "1" carbon hearing aid. The hearing aid could be left in the case with the mic showing though the hole at the front and used this way.
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