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The Compass Volume 2; A Monthly Journal for Engineers, Surveyors, Architects, Draughtsmen, and Students

The Compass Volume 2; A Monthly Journal for Engineers, Surveyors, Architects, Draughtsmen, and Students


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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. 1893 Excerpt: ...The adjustment 01 the Level Bubble consists in making the bubble axis G H parallel to the telescope axis of revolution A B, and consequently to the line of collimation, so that the bubble may correctly show when the line A B is perfectly horizontal. The adjustment of the Wyes consists in making the bubble axis, and with it the telescope axis, perpendicular to the spindle or centre E F of the instrument. When these three adjustments are effected, then the lines A B, C D-and G H will be parallel to one another, and also perpendicular to the line E E as. shown in Fig. 2. To adjust the Line of Collimation, first set up the Level firmly on its tripod, then bring the cross hairs into the focus of the eye-glass by means of the milled head at the eye-piece end of the telescope, so that they may be perfectly distinct and well defined. Now unlock and open the clips of the wyes, so that the telescope can turn round freely in its bearings. Direct the telescope upon some distant object, with clearly defined vertical or horizontal straight lines, and focus the objective so that the object may be clearly seen without parallax. Note that after the eye-piece has been adjusted as above stated, it should not again be touched, the remaining work of focussing being done by the objective alone. Now clamp the centres, and by means of the tangent screw bring one of the cross hairs to coincide exactly with the vertical or horizontal line selected, then turn very carefully, without in any way disturbing the instrument, the telescope half way round in its wyes, when, if the same hair again coincides exactly with the line, this hair is in adjustment, and we then proceed to try the other hair in the same manner. If this hair coincides also in both positions, then the line of collimatio...


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Product Details
  • ISBN-13: 9781153369138
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1153369133
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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