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Technologic Papers of the Bureau of Standards Volume 21-30

Technologic Papers of the Bureau of Standards Volume 21-30


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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. 1913 Excerpt: ...the points at which insulated radial return feeders might best be connected to the tracks. Another important practical aspect of this change in resistance with moisture content is its effect on the distribution of potential drops throughout the negative railway return area. Since the various parts of the pipe systems are buried at different depths and are very irregularly located with respect to the tracks, it is evident that changes in the moisture content with depth will exert a marked influence on the distribution of the resistance in the path of the leakage current, which in turn will greatly affect both the magnitude and distribution of the potential gradients through-20--16-12-8-4 0 4 8 12 16 20 TEMPERATURE-DEGREES C Fig. 8.--Effect of Temperature on Earth Resistance out the system. For this reason not as much reliance should be placed on voltage surveys made at extremely wet, and more especially at very dry periods, as on those taken under more nearly average moisture conditions. 2. EFFECT OF TEMPERATURE ON EARTH RESISTANCE The effect of temperature on the resistance of soil was determined throughout the range from about 18Cto--18C (oto 65 F). For this purpose a moist soil was used and was placed in a vessel surrounded by an ice chamber in which a mixture of ice and salt was placed, and the whole was allowed to stand until the temperature had reached about--180 C, the resistance being measured from time to time by means of electrodes which were embedded in the sample of earth and brought out by rubbercovered leads. The temperature of the earth was taken at the same time each resistance measurement was made, an ordinary mercury thermometer inserted in the center of a hollow electrode being used. The results of these resistance measurements as a functi...


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Product Details
  • ISBN-13: 9781130090833
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 136
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130090833
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 254 gr


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