The Bell System technical journal (1922) (14733168616)

Identifier: bellvol9systemtechni00amerrich (find matches)

Title: The Bell System technical journal

Year: 1922 (1920s)

Authors: American Telephone and Telegraph Company

Subjects: Telecommunication Electric engineering Communication Electronics Science Technology

Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)

Contributing Library: Prelinger Library

Digitizing Sponsor: Internet Archive

Text Appearing Before Image:

in use is the desk stand. As the result of extensive development workit has been possible to produce a hand set which has transmissioncharacteristics equal to those of the desk stand equipped with thebest instruments heretofore in use. The hand set development in-volved the solution of difficult problems, the principal of which wereto prevent singing or distortion of quality on account of the rigidconnection between receiver and transmitter and to make the trans- 10 BELL SYSTEM TECHNICAL JOURNAL mitter efficient through the wide range of positions in which it isplaced by the user. The latest form of this instrument is shown in Fig. 3. In additionto the usual black finish, this telephone as well as the bell box andother station apparatus have recently been made available in fivecolors, statuary bronze, old brass, oxidized silver, ivory and Frenchgray. Practically all the service for business purposes is provided byindividual lines or by private branch exchanges as discussed later. CSi^

Text Appearing After Image:

Fig. 3—The latest form of hand set. For residences, howeyer, there is in the United States a large develop-ment of two-party and four-party lines. The two-party stations areprovided with selective ringing so that each station is signaled onlyfor its own telephone messages, and the four-party stations are pro-vided in some places with selective ringing and in others with semi-selective ringing. Party lines have furnished a satisfactory means of providing serviceto small users and have been an important factor in the developmentof new fields of service in residences. To care for situations where something more than a single line TELEPHONE SYSTEM OF THE UNITED STATES 11 with one or two telephones is needed, but where an inter-communi-cating system or private branch exchange is not justified, so-calledwiring plans are used which provide various arrangements for associ-ating the station equipment with the telephone lines. For the mostpart the customers needs are satisfactorily met by one

rotary dial telephones the bell system technical journal 1930 book illustrations history of technology electric power engineering american telephone and telegraph company transmitter radio images from internet archive

1922

Prelinger Library

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