File:The telephone system of the British post office. A practical handbook (1901) (14756351425).jpg

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English:

Identifier: cu31924031255007 (find matches)
Title: The telephone system of the British post office. A practical handbook
Year: 1901 (1900s)
Authors: Herbert, Thomas Ernest
Subjects: Telephone Postal service
Publisher: London, New York, Whittaker and Co.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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>=S^ 1 ^ ♦ i-<vvvvyy ■^1 Figure 39. plete. It corresponds somewhat to the galvanometer which is used in thecase of telegraph circuits. If the wire is disconnected the bell at neitherstation rings. E 50 Bell-Blake Telephone Station.
Text Appearing After Image:
Figure 40. Short-Civcuiting Arrangements. 5t There are some magneto-generators which are joined up so as to cut outthe magneto bell and ring direct on to line, but it is very questionablewhether this is altogether an advantage. The amount of force requiredto turn the handle when the wire is disconnected and when the circuit iscomplete is very different, so that perhaps this indication might be deemedsufficient. This plan is adopted in connection with the call wire system inoperation at Manchester. Another plan for bringing about this short-circuiting of the armature isto place a disc of brass upon the spindle. Near the edge of this disc ahole about half an inch long is cut. A sleeve is placed upon the spindle,and upon this sleeve is placed a crank which carries a pin fixed at right

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Flickr tags
InfoField
  • bookid:cu31924031255007
  • bookyear:1901
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Herbert__Thomas_Ernest
  • booksubject:Telephone
  • booksubject:Postal_service
  • bookpublisher:London__New_York__Whittaker_and_Co_
  • bookcontributor:Cornell_University_Library
  • booksponsor:MSN
  • bookleafnumber:65
  • bookcollection:cornell
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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current06:41, 18 September 2015Thumbnail for version as of 06:41, 18 September 2015658 × 1,448 (370 KB) (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': cu31924031255007 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcu31924031255007%2F f...

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