Home > Duplex and Quadruplex Telegraphy; Multiplex Telegraphy Testing of Circuits Printing and Messenger-Call Systems Submarine Telegraphy High-Speed Telegraphy: (English)
Duplex and Quadruplex Telegraphy; Multiplex Telegraphy Testing of Circuits Printing and Messenger-Call Systems Submarine Telegraphy High-Speed Telegraphy: (English)

Duplex and Quadruplex Telegraphy; Multiplex Telegraphy Testing of Circuits Printing and Messenger-Call Systems Submarine Telegraphy High-Speed Telegraphy: (English)

          
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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. 1913 Excerpt: ...arm d is turned to the left, the sounder 5 and key K may be used as a branch-office sounder set. If both wedges a and b, placed together as shown, are inserted in a similar jack and both switch arms c and d are turned to the left, the two sounders and keys are merely connected in series in the branchoffice line and the addition of the 4 ohms in the sounder S' in such a circuit will not appreciably reduce the current. SPLIT LOOPS 30. A method of splitting a loop suitable for use in connection with a baseball, race track, or other branch office is shown in Fig. 12. In the loop at the branch office are two relay or mainline sounder sets, as usually connected. The arm b of the switch, which is the only extra device required, is normally in the middle position here shown. The loop is split, that is divided into two independent line circuits with ground returns, by turning the arm b of the switch to contact a, which is connected to ground. With the arm b turned to c, the upper relay set is cut out. This shunt arrangement is not always provided and is used merely to allow the removal of the upper set without disturbing the lower set, which may be in use at the time. At the main office, the line wires run to spring jacks and straps on the main switchboard, by which arrangement the two line wires may be used as a loop or as two single wires. r Across the binding posts on the back of the switchboard is connected a flexible cord terminating in a wedge on the front of the switchboard. By inserting this wedge in the proper jack, the branch-office loop can be connected to any desired line, or the branch-office line wires may be connected by inserting the wedge in the proper loop-switch jack to the local circuit of a duplex set, so that by splitting the loop by turning th...


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Product Details
  • ISBN-13: 9781130835915
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 166
  • Series Title: English
  • Weight: 308 gr
  • ISBN-10: 113083591X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 9 mm
  • Width: 189 mm


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Duplex and Quadruplex Telegraphy; Multiplex Telegraphy Testing of Circuits Printing and Messenger-Call Systems Submarine Telegraphy High-Speed Telegraphy: (English)
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