Electrical Record Volume 31

Electrical Record Volume 31

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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. 1922 edition. Excerpt: ...insulation tube and a patented contact part with a wire-holding device which permits quick assembly and ofters good electrical surface contact. There is no need for soldering the 'wire as the device clamps the strand in circular shaped jaws while a screw holds the jaws tight without touching the wire. The shell of the plug, shown on the left of the accompanying illustrations, measures approximately iy, in. long. Battery Discharge Set A device for testing batteries at high discharge rates and made with a compact and durable construction, entirely of cast iron, is provided in the battery discharge set, recently placed on the market by the J-M-P Manufacturing Company, 172 Seventh Street, Milwaukee, Wis. The coils are made of a specially selected ribbon resistance, entirely open to permit rapid cooling, and when properly connected to a 6 or 12-volt battery will not burn out although the discharge may be continuous, the maker states. Connections are provided and can be so arranged that currents ranging from 50 to 600 amp. may be obtained but with the standard connections, three in number, 75 to 150 amp. will flow from thebattery, these being the average currents necessary to operate 12 and 6-volt starting motors, respectively. By changing these connections and the number of cells the other amperages are available. Testing is always carried out with a voltmeter with a 0.3-volt scale to determine the conditions of the cells while discharging and, as each cell must be read independently, it is not incorporated with a set of this kind. The capacity of a battery may be determined with the aid of tables submitted by the manufacturer. For example, a 6-volt ll-plate battery should stand a discharge on connections No. 1 and No. 2 for 14 min. before the...show more

Product details

  • Paperback | 448 pages
  • 189 x 246 x 23mm | 794g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236884620
  • 9781236884626