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A Guide for the Electric Testing of Telegraph Cables: (English)

A Guide for the Electric Testing of Telegraph Cables: (English)

          
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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...obtained. E Kegular fall of the deflection indicates good condition of the cable; with decrease of insulation the deflection will increase. By disconnecting T from, and connecting S to, the cable, the ship is put in circuit for speaking. 2. On shore (Fig. 11) the cable end is connected to a commutator, and a clock causes, every tenth minute, the arm v q to touch for some few seconds the button r, charging the condenser and at the same time giving a throw on the ship galvanometer; when the arm p q again touches the button t, the condenser is discharged through the shore galvanometer. Instead of a commutator, an ordinary charge and discharge key may be used worked by hand. If the insulation is decreasing the discharge becomes smaller, and in the event of loss of continuity, or a total loss of insulation, neither charge of the condenser nor discharge will be obtained. The ends of the cable must always be kept dry and paraffined. If the cable is permanently connected through a very high resistance R2 and a galvanometer G2 to earth, ship is able to signal at any time to shore by either reversal or reduced tension, and shore obtains by this arrangement a permanent insulation and continuity test. For this resistance a bar of selenium, or a plumbago line on glass may be used, and a suitable shunt may be used to make the deflection on the galvanometer scale about 200 divisions. 3. Both ship and shore must be provided with a complete set of testing apparatus, always kept ready for testing at any moment. 35. INSTEUCTIONS FOE TESTING ON SHIP AND ON SHOEE. 1. On ship the cable being connected to galvanometer for insulation test, the deflection is read every minute and noted down. The resistance of the battery and the constant of the galvanometer being...


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Product Details
  • ISBN-13: 9781234376451
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Series Title: English
  • Weight: 64 gr
  • ISBN-10: 1234376458
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 1 mm
  • Width: 189 mm


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