Handbook of Astronomy
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Handbook of Astronomy

Handbook of Astronomy


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: angle Bcd', or the deviation of the line of collimation from the perpendicular D c. zj. To render the direction of the supports due east and west. This Ls in some cases accomplished by a Meridian Mark, which is a distinct object, such as a white vertical line painted on a s, black ground, erected at a sufficient ! distance from the instrument in the t exact meridian of the observatory. / If, on directing the telescope to it, / it is seen on the one side or the other / of the middle wire (which ought to ', I coincide with the meridian), the '. / direction of the axis A.n, jitj. 8., will '; deviate to the same extent from the true east imd west, since it has been already, by the previous adjust- ments, rendered perpendicular to the line of collimation. The entire instrument must therefore be shifted round, until the meridian mark co- A incides with the middle wire. This Fig 10 is accomplished by a provision made in the support on which the extremity of the axis B, Jig. 8., rests, by which it has a certain play in the horizontal direction urged by a tine screw. In this way the axis A B is brought into the truo direction east and west, and therefore the line of collimation into the true meridian. It will be observed that, in explaining the second adjustment, it has been assumed that the deviations are not so great as to throw the object s out of the field of view after the instrument is reversed. This condition in practice is always fulfilled, the extent of deviation left to be coiTfcted by the adjustments being always very small. 28. Micrometer wires method of observing: a transit.- In the focus of the eye-piece of the transit instrument, the system rf micrometer wires (ll), already mentioned, is placed. This consists common...


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Product Details
  • ISBN-13: 9781458832610
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 250
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 1458832619
  • Publisher Date: 01 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 454 gr


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