Hearing Aid

Hearing Aid

Usage conditions apply
The Acousticon Model 28, a single microphone carbon bearing hearing aid, consists of a bone conduction headpiece with band, and amplifier. It was made by the Dictograph Products Company, Inc., in New York City, in 1928. This example was donated to the Smithsonian in 1939.
Ref: Kelley M. Turner and Norton W. Johnston, “Carbon-Ball Transmitter,” U.S. Patent 844,635 (Feb. 19, 1907), assigned to General Acoustic Co.
Currently not on view
Object Name
hearing aids
Other Terms
Dictograph Products Company
overall: 3 1/2 in x 1 in; 8.89 cm x 2.54 cm
ID Number
catalog number
accession number
Credit Line
Dictograph Products Company, Inc.
See more items in
Medicine and Science: Medicine
Data Source
National Museum of American History
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