Jump to content

File:Bell telephone magazine (1922) (14569847558).jpg

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (2,816 × 1,910 pixels, file size: 504 KB, MIME type: image/jpeg)

Summary

Description
English:

Identifier: belltelephonemag09amerrich (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
fall back, and then closed the circuit through heavycalling battery B-l, operating tap bell R-D. The operatorthen shifted plug P-d from the right-hand to the left-hand hole,disconnecting subscriber Z)s central office burglar alarm circuitand connecting the operators telephone, T, to subscriber Z)sline. When his bell rang, subscriber D moved his substationswitch from the right-hand to the left-hand contact, thus dis-connecting his substation burglar alarm circuit from his lineand connecting in his telephone, T-D. The operator, after notifying subscriber D that subscriber Bwished to talk with him, removed plug P-d from the left-handhole, moved switch 5 to its right-hand contact, and insertedplug Q, at the end of cord C, in hole H-d. This placed thetelephones of subscriber B, the operator and subscriber D all inone circuit (Fig. 4). The operator could thus determine, bylistening in, when the conversation was finished. When thisoccurred, the operator withdrew plug Q from hole H-d, re- 209
Text Appearing After Image:
210 THE FIRST TELEPHONE SWITCHBOARD placed plugs P-b and P-d in the right-hand holes of the centraloffice plug and block switches, and moved switch 5 to its left-hand contact. When subscribers B and D had moved theirsubstation switches to the right-hand contacts, the operatorrestored the shutters of annunciators A-b and A-d (the latterhaving fallen when its galvanometer circuit was opened), andclosed switch W. The apparatus at the central office and sub-stations was then in readiness for another call to be made. G. K. Thompson,R. B. Hill. Note: The authors wish to express their indebtedness to Mr.W. L. Richards, Consulting Historian of the Bell TelephoneLaboratories, for his assistance in the preparation of this arti-cle. 211 Worlds Telephone Statistics January 1, 1929 ACCORDING to the latest annual survey of the worldstelephones which was recently completed by the ChiefStatisticians Division of the American Telephone and Tele-graph Company, there were 32,712,284 telephones in the wor

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Date
Source

https://www.flickr.com/photos/internetarchivebookimages/14569847558/

Author Internet Archive Book Images
Permission
(Reusing this file)
At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
9
Flickr tags
InfoField
Flickr posted date
InfoField
27 July 2014

Licensing

This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
  1. The copyright is in the public domain because it has expired;
  2. The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
  3. The institution owns the copyright but is not interested in exercising control; or
  4. The institution has legal rights sufficient to authorize others to use the work without restrictions.

More information can be found at https://flickr.com/commons/usage/.


Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information.
This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14569847558. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

17 September 2015

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

image/jpeg

d1d1d87e43be3e63cf0acf5922a273633077b4d1

515,624 byte

1,910 pixel

2,816 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current00:00, 25 May 2016Thumbnail for version as of 00:00, 25 May 20162,816 × 1,910 (504 KB)SteinsplitterBotBot: Image rotated by 90°
18:33, 17 September 2015Thumbnail for version as of 18:33, 17 September 20151,910 × 2,822 (488 KB)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': belltelephonemag09amerrich ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fbelltelepho...

The following page uses this file:

Global file usage

The following other wikis use this file: