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Manual of Visual Signaling of U.S. Signal Corps Volume 8

Manual of Visual Signaling of U.S. Signal Corps Volume 8


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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. 1906 Excerpt: ...is shown in figure 116. As will be seen in the diagrams, the lines come to the relay, thence to the body of the key, thence to the back contact of the key, and thence to the ground. This is the receiving position and the current from distant stations will operate the relay. When the key is depressed the back contact is broken and the front contact made. This will cause the home battery to be in circuit and operate the relays. Special care must be taken not to screw the key so close that both front and back contacts touch. This would short-circuit the battery and speedily ruin it. The key has a back, middle, and front contact, as shown, the battery being put to line only when the key is depressed. The sounder should be wound to 6 ohms to correspond to the higher voltage and lower resistance of the open-circuit type of battery used as a local. Fig. no. For circuits over cables exceeding 15 miles in length the polarized relay will be utilized. This relay is fully described in Signal Corps, Manual No. 4. The closed circuit or American system is shown in figure 117. As ordinarily provided in fire-control work, the battery is located in the district commander's station and no battery is supplied to other stations. Each key is furnished with a circuit-closing lever, and when the line is quiet a current is constantly running, keeping the relays and sounders closed. AYhen any station opens its circuit by means of the lever, that station controls the line entirely with the key. The type of closed-circuit system shown in this figure is the standard arrangement for connection with commercial lines and may also be used for fire-control lines. In short cables, however, the main-line sounder (fig. 118) may be furnished, dispensing with the sounder s, together with its bat...


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Product Details
  • ISBN-13: 9781130489293
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 112
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130489299
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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