File:Telephones and telegraphs- 1902 - (and Municipal electric fire alarm and police patrol systems) (1906) (14753948284).jpg

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English:

Identifier: cu31924022817674 (find matches)
Title: Telephones and telegraphs: 1902 : (and Municipal electric fire alarm and police patrol systems)
Year: 1906 (1900s)
Authors: United States. Bureau of the Census Steuart, William Mott, 1861- Martin, Thomas Commerford, 1856-1924 Abbott, Arthur Vaughan, 1854- Mayer, William
Subjects: Telephone Telegraph Fire alarms
Publisher: Washington : Govt. Print. Off.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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FIG. 1.—SMALL MAGNETO SWITCHBOARD. FIG. 2.—REAR VIEW OF MAGNETO SWITCHBOARD.
Text Appearing After Image:
EARLV TELEPHONE EXCHANGE IN NEW YORK CITY. CENTRAL OFFICE OR EXCHANGE. 47 function is to draw the cord back to its place as soonas the operator has removed it from the jack and thuskeep the cord shelf free. A rear view, showing theapparatus contained, is given in Fig. 2 on platefacing page 46. An operator can usually attend to about one hundredlines, and magneto boards are as a rule built in sec-tions accommodating this number. As the numberof subscribers increases, succeeding sections may beset up in proximity to each other, and, so long as theexchange is limited to three operators, each can reachthe jacks of all subscribers, and hence can connectwith all. When more than three operators are needed,it is impracticable for each operator to reach all thejacks. There are two solutions: One, the so-called trans-fer system, in which, if a subscriber calls for a partywhose jack is out of the operators reach, she maytransfer the call to some other operator before whom thejack of the desired

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27 July 2014

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current09:14, 17 December 2018Thumbnail for version as of 09:14, 17 December 20182,468 × 3,347 (1.31 MB)Faebot (talk | contribs)Uncrop
17:28, 17 September 2015Thumbnail for version as of 17:28, 17 September 20152,082 × 1,244 (1.18 MB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': cu31924022817674 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcu31924022817674%2F f...

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