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Account of the Operations of the Great Trigonometrical Survey of India Volume 10

Account of the Operations of the Great Trigonometrical Survey of India Volume 10


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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. 1887 edition. Excerpt: ...were few. It was considered that more frequent change of pivots would be of use in furnishing more equations for investigation of pivot error and other instrumental defects; the reversal was therefore made after each night's work, instead of only once during conditions of observation, the moveable Ys described in the final paragraph of Section 2, Chapter I, were turned through 180 of azimuth one at a time at both stations, for the first two arcs only. Collimation and level were observed more frequently than in former years, three determinations each night being considered the normal number. In order to keep a watch as far as possible upon any instability in the tubes which had had such a disastrous effect in the preceding season, the collimators were intersected by the threads of the transit instrument by bringing the telescope alternately down from the zenith and up from the nadir, as it was supposed that the varying strains produced by this method would bring to light any imperfection of the kind. 4. Difficulties experienced in Leveling. The observers found considerable difficulty in Calcutta in seeing the reflection of the spider lines in the mercury trough with the Bohnenberger eye-piece when leveHng the transit instruments, owing to tremors of the ground; and some experiments were made with a view to diminishing the vibration of the surface of the mercury caused by the extreme instability of the Calcutta soil, an instability so great that a tremor, sufficient to obliterate the reflected image of the wires, was set up by the wheels of a passing carriage long before even the sound of the carriage could be heard. A cough or sneeze from one of the men standing in the observatory tent would often render the image invisible for a second or...


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Product Details
  • ISBN-13: 9781234215965
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 44
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1234215969
  • Publisher Date: 15 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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