File:The practical telephone handbook and guide to the telephonic exchange (1906) (14733237406).jpg

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English:

Identifier: practicaltelepho00pool (find matches)
Title: The practical telephone handbook and guide to the telephonic exchange
Year: 1906 (1900s)
Authors: Poole, Joseph
Subjects: Telephone
Publisher: New York, Macmillan Co.
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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Text Appearing Before Image:
THE BRITISH INSULATED CO.S EXCHANGES 479 The ultimate capacity of the boards is 10,000. The frameworkof the sections is strongly constructed of angle iron faced andfinished off at the front with polished mahogany. The cableshelves are of sheet iron, the one for the multiple cables com-pletely dividing the section and board into upper and lowerfireproof compartments when the sheet-iron shutters are inposition. In the lower compartment of each position is fitted the
Text Appearing After Image:
Fig. 450.—Arrangement of Apparatus at Rear of the Sections(Reproduced from Electrical Engineering by permission of the Proprietors) apparatus necessary for each operators equipment, as shownin Fig. 450 (which shows the three positions of a full section).The numbered squares are the backs of the dust-proof coversof the 17 sets of relays and retardation or inductance coilsrequired for the 17 pairs of cords supplied to each position.Above these are the resistance spools and next above these arethe condensers, induction coils, relays, etc., required for theoperators instrument and above these is the cord shelf on which 480 PRACTICAL TELEPHONE HANDBOOK the ends of the cords are fastened, and above these again arethe cables connecting to the calling lamps and answering jacks,and also those for the outgoing junction line jacks, which arefitted over the answering jacks. Above these is the dividingmultiple cable shelf, on which lie the multiple cables as shown.Below the numbered relay cases

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https://www.flickr.com/photos/internetarchivebookimages/14733237406/

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Flickr tags
InfoField
  • bookid:practicaltelepho00pool
  • bookyear:1906
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Poole__Joseph
  • booksubject:Telephone
  • bookpublisher:New_York__Macmillan_Co_
  • bookcontributor:Northeastern_University__Snell_Library
  • booksponsor:Boston_Library_Consortium_Member_Libraries
  • bookleafnumber:508
  • bookcollection:northeastern
  • bookcollection:blc
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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