The Tone Generator described in these proceedings a year ago has been used successfully as a telephone transmitter and receiver. A loud speaker about eight inches in diameter has been made which will speak loudly enough to address a small gathering of people, say a hundred. The main advantage of the instrument is its faithfulness of reproduction of speech and music, the failure to do which is the chief disadvantage of all other known telephone instruments. The instrument when used as a transmitter is free from all the usual transmitter noises, and from distortion due to resonance of the diaphragm.
Proceedings of the Iowa Academy of Science
©1922 Iowa Academy of Science, Inc.
Hewlett, C. W.
"A New Kind of Telephone Reciever and Transmitter,"
Proceedings of the Iowa Academy of Science, 29(1), 151-151.
Available at: https://scholarworks.uni.edu/pias/vol29/iss1/35