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Engineering and Scientific Papers Volume 3-16

Engineering and Scientific Papers Volume 3-16


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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. 1921 Excerpt: ...varied with the number of turns in the coil. For single-layer coils four sets were measured having 10, 20, 40, and 60 turns each; these coils are typical of those used in short wave receiving. In each set the A coils were of solid wire (number 20 double cotton covered); B coils were braided (32 strands of number 36 enamelled wire); C coils were twisted cable (three cables twisted together, each consisting of 16 number 38 enamelled wires, twisted together); D coils were twisted (three cables twisted together each consisting of 40 number 40 enamelled wires twisted together).11 All of these coils were wound on bitumen spools; coil E was wound on very thin paper tubing, coated with shellac. Three sets of banked winding coils were also tried to see if the conclusions reached for the single-layer coils could be applied to multi-layer coils. All resistance values together with dimensions and construction of coils are given in Figures 15-18. It will be noticed that altho the cable coils have a continuous current (d.c.) resistance nearly twice as much as the solid wire, thruout most of the frequency range tested their resistance is only about one-half as much as the solid wire, showing that the stranding has made the cross-section four times as effective in one case as in the other. "Diameter of number 20 wire =0.032 in. =0.082 cm. Diameter of number 36 wire =0.005 in. =0.013 cm. Diameter of number 38 wire =0.004 in. =0.010 cm. Diameter of number 40 wire =0.003 in. =0.008 cm. For wave lengths less than 400 meters the cable resistance increases more rapidly than the solid wire, and for wave lengths less than about 250 meters the solid wire has less resistance than the cable. To find the effect of possible losses in the bitumen spools, a pair of coils of exactly ...


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Product Details
  • ISBN-13: 9781130978421
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 112
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130978427
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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