File:Bell telephone magazine (1922) (14733269916).jpg

Identifier: belltelephonemag15amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
Replica of Transmitter-Receiver Used in First Long Distance Conversation, Between Boston and Canibridgeport, Mass., two miles: 1876.
Text Appearing After Image:
Telephone Used in Talking .(round the World,jroni and to Xeiv York City, 23,000 Miles: 1935. Figure 18 THE BELL SYSTEM HISTORICAL MUSEUM transmitter of 1931 and the non-directional moving coil trans-mitter of 1935. There are also several samples of air-dampedand stretched steel diaphragm transmitters of the 1916-1920vintage. A few of these microphones are shown in Figure 16.The loud speaking receiver development has kept pace withthat for microphones. Among our more important exhibitsare the No. 177 type loud speakers originally designed in 1911for train dispatching, through which were heard in Paris thefirst words crossing the Atlantic by wireless in 1915; one of theeight No. 196 t)^e balanced armature receivers (and its 103^foot horn, shown at the left of the exhibit case, Figure 11) usedat President Hardings inaugural in 1921; and a No. 555 typemoving coil armature, which was developed primarily for usewith the Vitaphone talking pictures, first publicly demonstratedAugust 7, 1926.

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