Globe Model "1917" Carbon Hearing Aid The Globe Model "1917" carbon hearing aid was manufactured by the Globe Ear Phone Company of Boston, MA in 1917. Without the battery, the whole unit weighed 8.3 oz (236 g). Here is a blurb about the Globe "1917" carbon hearing aid. |  | Click picture for larger view | | | | | | |
| Front view of the Globe Model "1917" carbon hearing aid microphone. Around the perimeter it reads, "Globe Ear Phone Company Boston" and "Patented". The microphone was 2 11/16" (6.9 cm) in diameter and 15/16" (2.4 cm) thick.
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| Rear view of the Globe Model "1917" carbon hearing aid. The serial number (25267) is near the bottom.
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| The Globe Model "1917" carbon microphone could be mounted directly on the battery since the microphone pin sockets were exactly the same spacing as the terminals on the battery.
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| The Globe Model "1917" carbon hearing aid directly mounted on the battery. This hearing aid used the Globe No. 5 3-volt battery.
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| The Globe Model "1917" carbon microphone could also be used separately using a battery extension cord. The extension cord plugged into the pin sockets on the microphone (shown unplugged).
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| The Globe Model "1917" carbon microphone shown plugged to the battery extension cord.
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| The battery end of the battery extension cord showing how the battery pins plugged into the pin sockets on the end of the battery extension cord.
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| When the Globe Model "1917" carbon hearing aid was used with the battery extension cord, the battery could be hidden away in a pocket. The battery extension cord was about 20" (50 cm) long.
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| The cylindrical volume control was locatied on the earphone cord about 5" (12 cm) from the microphone. The design of this volume control received a patent on February 20, 1912.
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| The volume control for the Globe Model "1917" carbon hearing aid was a 10-position slider. "Off" was at the bottom and loudest at the top.)
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| Looking into the slider slot on the Globe Model "1917" carbon hearing aid's volume control showing 7 of the 10 contacts. Each position had a different resistance, thus varying the volume.
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| Front view of the earphone of the Globe Model "1917" carbon hearing aid. The earphone was 2 3/16" (5.5 cm) in diameter and 11/16" (1.7 cm) thick.
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| Rear view of the Globe Model "1917" carbon hearing aid earphone showing how the headphone band attached to it.
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| The earphone and headband of the Globe Model "1917" carbon hearing aid.
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| View of the Globe Model "1917" carbon hearing aid in its carrying case. |  | Click picture for larger view | | | |
| The inscription on the inside of the lid of the carrying case. In the oval circle (top) is the word "Trade" then "Ear-Phone" then "Mark". Below it are the words, "Globe Ear-Phone Co." then "Hearing Instruments" then "Tremont Temple" then "88 Tremont St" then "Boston". |  | Click picture for larger view | | | |
| Outside view of the carrying case of the Globe Model "1917" carbon hearing aid. Note: this hearing aid didn't see much use. June explained in a note, "This was my great-grandmothers back in the early 1900s. I remember my great-grandmother telling me that she didn't like to use it. It has been sitting in her attic ever since."
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