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Proceedings Constitution and By-Laws Volume 9

Proceedings Constitution and By-Laws Volume 9


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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. 1906 Excerpt: ...the magnifying power of the eye piece, diminishes the light and definition, which in turn reduces the length of sight, and retards the speed. To increase the sensitiveness of the bubble requires more stability. So it will be apparent that there is, a happy medium, but just what the medium is, appears to be an open question. Another important feature is, how shall the bubble tube be attached to insure its parallelism to the line of collimation, and how can we best control the minute movement of the line of collimation, which is registered by these sensitive bubbles? Seemingly, a bubble tube which is rigidly fixed to the telescope and made parallel to the line of collimation would be all that could be desired, more especially if the length of sights were of equal length, and could be maintained so through the work. Practice has demonstrated that a striding level more fully fits all the requirements, and especially so when we know the difficulty of maintaining sights of a uniform length and securing collars for the telescope which are of the same dimension. The micrometer movement of the telescope is the best device yet designed for controlling the sensitive bubbles, but just how this movement shall be applied is certainly a debatable question. Plates 2, 3 and 6 show the telescope hinged at the object end of the horizontal arm, and at a point approximately 4 in. from the spindle, Figs. 4 and 5 are cradled at the center. Certainly the center cradling of the telescope is the theoretically correct one, yet the maximum error which would be caused by an instrument hinged at one end, and properly used by a competent levelman, would not exceed rs m m for each station. This could be eliminated by cradling at the center, but at a sacrifice of more wearing parts (as it ...


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Product Details
  • ISBN-13: 9781130617337
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 72
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130617335
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 145 gr

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