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Construction of Underground Conduits Volume 2

Construction of Underground Conduits Volume 2


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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. 1903 Excerpt: ... are much greater, higher rates are necessary. In the case of telephone installations, particularly at the present time, a large factor in the depreciation account is the constant improvement in methods and systems which renders the best constructed plants obsolete and valueless long before they are actually worn out. There are few telephone offices in the country that have survived five years without rebuilding, and none that have lived a decade, owing to the very rapid improvements which have taken place in switchboard and sub-station construction. With the wire plant, life is longer as the rate of improvement is slower, and, in case of underground construction, the plant is on the whole of a durable character. Depreciation is usually, and most conveniently, expressed at such an annual percentage rate upon the prime cost of construction as will amount at the end of the probable lifetime of the plant to the cost of replacement. Strictly speaking, legal rates of interest on each of the annual amounts set aside should be allowed for the number of years each is held in reserve. But as this refinement adds to the labor of calculation, and as the probable lifetime of plants varies considerably with time and place, sufficient accuracy is usually secured by the simple plan of annual percentage. As actual experience with underground conduits does not extend over more than a decade and a half, rates of depreciation must be largely estimated. Methods of manufacturing duct material are being improved; competition tends to reduce prices; superior and cheaper methods of street construction all operate to reduce depreciation charges upon subways. Conduits constructed of terra-cotta, in concrete, from all experiences with similar structures, are of great durability. Doub...


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Product Details
  • ISBN-13: 9781130257731
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130257738
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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