Electrician's Handy-Book of Useful Information

Electrician's Handy-Book of Useful Information

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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. 1897 edition. Excerpt: ... on local contact springs caused by dust. T rambler oell contact faulty through dust, causing a break in ringing circuit. Residual magnetism, causing a break by attracting The armature and keeping the spring from the contract pin. Faulty contact against back stop of ringing key. Batteries.--Cracked cell, allowing the solution to run away. Corroded, loose or dirty terminals or wires. Faulty connection of wire to zinc rod. Faulty connection between lead cap and carbon. Ex/zausted solution, shown by crystals forming on zinc and porous pot. Zinc rod consumed. Switc/2-Room Faults.--Indz'cators sticking, owing to rusted pivots preventing armature moving, or to the shutters being too upright, so that they do not fall over when released. A little bending over will generally remedy the latter fault. Bad contacts in spring-jacks, caused by dust. By means of a thin steel spring, provided with a handle and roughened by being cross-filed with 'a coarse file, the contacts in the jacks may be cleaned from the front of the table. Baa' joints, due to defective soldering. Dast on t/zc back contacts of ringing keys. For locating faults on the W. E. Co.'s multiple board, an ebonite spring-jack plug is used to lift up the springs from their contacts without connecting them to the test-wire. By doing this on successive tables, and testing from the test-room, an earth or contact can be traced to a certain part of the board. Line Faults.--When faults are traced to the line they are handed over to the Linesmen, whose duty it is to find the cause and remedy it, and who should be perfectly familiar with the various routes and the wires upon them. Line faults come under three principal headings: 1. Contacts between different lines. 2. Eart/2...show more

Product details

  • Paperback | 86 pages
  • 189 x 246 x 5mm | 168g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236844785
  • 9781236844781