Pocket Handbook of Useful Information, Price Lists, Telegraph Code, &C Volume 17
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Home > Art, Film & Photography > Pocket Handbook of Useful Information, Price Lists, Telegraph Code, &C Volume 17
Pocket Handbook of Useful Information, Price Lists, Telegraph Code, &C Volume 17

Pocket Handbook of Useful Information, Price Lists, Telegraph Code, &C Volume 17


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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: ...equals 376, has the same value for telephonic transmission, it will be observed that not more than miles of No. 22 B. & S. G. cable, .12 microfarads per mile, could be used if the service is to be of the standard given by 10 miles No. 19 B. & S. G., .08 cable; and this is shown by the following application of the formula: The total electrostatic capacity of the circuit would be, .12x5.75=.69 microfarads; and the total conductor resistance, 95x5.75=545 ohms, and when these are substituted in the formula, we have.69x645=876. It should be remembered that doubling the lengths of cables in the above example, would change the relation in "talking values" since the lengths enter into the calculation as squares and not as simple functions. The following table shows in convenient form the relative values of electrostatic capacity multiplied by resistance, for 10 miles of cable with various conductors and electrostatic capacities in general use: VALUES OF C FOR TEN MILES OF CABLE The following table shows the various combinations of length, capacity and resistance, of telephone cables required to produce the same arbitrary talking value. In other words, it will be observed from this table that a telephone cable 2,656 feet long, made up of No. 19 B. & S. G. wires having a capacity of.08 mis. per mile, will have the same talking value as 877 feet of telephone cable made up of No. 22 B. & S. G. wires having a capacity of.12 mfs. per mile: LENGTHS OF VARIOUS CABLES FOR SAME TALKING VALUE Notwithstanding the fact that for the last fifteen to eighteen years there has been one accepted and regular trade standard method of testing for electrostatic capacity, if specifications are not exact and definite upon all points, and especially if they do not des...


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Product Details
  • ISBN-13: 9781130635195
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 110
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130635198
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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Pocket Handbook of Useful Information, Price Lists, Telegraph Code, &C Volume 17
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