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How to Read Telephone Circuit Diagrams

How to Read Telephone Circuit Diagrams


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ... to move. Double pole magnets are shown in Figs. 252 to 257 inclusive. In Figs. 252 and 253 the horseshoe shape of core is shown, Fig. 252 being different from Fig. 253 principally in the showing of permanent magnetic polarization of its core, but differing also in the relative direction of its windings on the two poles. Fig. 254 shows a U-shape magnet which is the most common of all forms of double-pole magnets. A heel piece of soft iron connects the rear ends of the two spools. Figs. 255 and 256 show return-pole-piece magnets, and differ from each other only in the showing of permanent magnetism. In Fig. 257 extension pole pieces for both ends of a single spool are shown, whereby the single straight core may present both of its ends to an armature placed parallel to the core. Certain relations sometimes existing between the windings of multiple-wound magnets may be studied before leaving the subject of magnets in general. The symbol of Fig. 258 shows a split-wound magnet; Fig. 259 a differentially wound magnet. In each of these symbols the windings are so connected in the symbol as to indicate that the device is wound to provide that special connection. Fig. 260 symbolizes a magnet with two independent windings which may be con Figs. 258 to 264. Methods of Connecting Windings. nected in any manner desired. The magnet of Fig. 258, when its helix is traced from extreme terminal to extreme terminal in either direction, at all times has its current effective, to magnetize its core, yet either part of the core may be used independently; this is called a split winding. Fig. 259, when traced similarly from either extreme terminal to the other extreme terminal, in either direction, has its current ineffective or differential upon its core, and the core can be mag...


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Product Details
  • ISBN-13: 9781130150841
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130150844
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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