File:Bell telephone magazine (1922) (14733367426).jpg

Identifier: belltelephonemag08amerrich (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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n use. Each of the conven-tions, of which there are thousands, is made up to in-dicate the essential functions of the piece of equipmentas it affects the circuit, without showing the mechanicsof the design of the apparatus involved. It also coversthe abbreviations which are normally used on circuitdrawings. As an example of the effect of standardization inthis particular. Figures 1 and 2 are of interest. Fig-ure 1 is a drawing of a simple cord circuit made in 1889.Figure 2 shows how the drawing of the same circuitwould be made today. The great reduction in laborof drafting and much greater ease of interpretation ofthe drawing are evident. Of the above conventions those which are in generaluse by all telephone manufacturers are in process of (17) Bell Telephone Quarterly approval by the American Engineering StandardsCommittee as American standards, thus assuring uni-formity of these conventions, not only within the BellSystem but among telephone manufacturers outsidethe System as well.
Text Appearing After Image:
~T Generator JL 50 ohms Testing Plug Fig. 1 The general plan outlined above for drawings isalso used for the distribution of specifications for equip-ment design. Specifications prepared by the headquar-ters forces are distributed to both the manufacturingand the operating branches of the organization. These (18) Standardization in the Bell System specifications are made uniform in style and size to fa-cilitate their use and their filing.

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