File:The practical telephone handbook and guide to the telephonic exchange (1906) (14569583050).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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Mercury-Arc Rectifier 578 APPENDIX The efficiency of the apparatus ranges from about 76 % atone quarter of full load and upwards. For further particulars the reader is referred to an articleby Mr J. E. Milnes in The National Telephone Journal for March1908. New Pattern Instrument Plug and Jack.—Fig. 521 shows newpatterns of instrument plug and jack which are used in con-
Text Appearing After Image:
Fig. 521.—New Form of Instrument Jack and Plug (Scale f) nection with switch-boards for connecting the operators in-struments, in place of the patterns shown in Figs. 97 and 98,as being neater and more compact. The connections to thedifferent sections of the sleeve of the plug are made throughconcentric metal tubes to the connecting rings shown at theback. When the plug is properly inserted into the hole in thejack, shown by dotted lines, the springs of the jack press on theseveral sections of the sleeve of the plug. Calculation of Capacity and Inductance of Lines.—If h —height above the ground of a single wire and earth aerial line ;r =radius of section of wire ; d ^distance between the centresof wires of an aerial loop line; and k =the capacity in faradsper mile; then / 0-03884\ For a sinqle wire line, k =( 7 2/& )10 /0-01942\For a loop line, k =( i o. d J10 Inductance l in henrys per mile. -6 APPENDIX 579 For a single wire line, i =(008045 +0*7421 log10— )l0 3 For a loo

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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:607
  • bookcollection:northeastern
  • bookcollection:blc
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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