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Contributions from the Observatory of Columbia University, New York Volume 10-21

Contributions from the Observatory of Columbia University, New York Volume 10-21


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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. 1897 Excerpt: ...method of measuring follows immediately. The microscope being pointed at a star, the micrometer is read; then by means of the lever arm, it is made to point at the scale, and, without moving the microscope itself, the screw is turned until the threads cover the next lower division, and the head is again read. The difference of the two readings, added to the number of the line, will give the position of the star with respect to the scale, since the micrometer is so arranged, that the head will show increasing numbers, when the threads are made to move in a direction opposite to increasing numbers on the scale. To measure the plate, then, the following operations were always performed: Set the plate correctly in the holder, i. ., so, that the measured coordinates will coincide approximately with right ascension and with declination. This is done by first making the line joining the central star with its trail (or third image) parallel to the cylinder, and then turning the plate through go, in such a way that the trail shall be to the right.1 Then will the hour angle increase toward the left on the plate, and the direction of a circle of declination will be perpendicular to the scale. Read the graduated circle on both microscopes, observe for runs,2 and take the temperature. Now measure the position of each star as follows: Point the microscope on the East Image of the star and read the micrometer; point at the scale and read twice on the next lower line; point again on the star and read. Move the microscope so that, the micrometer standing approximately at the same point as before, the wires bisect the West Image. Re 1 Note.--It will be seen that this method of orientation involves an error due to the curvature of the path of the central star on the pl...


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Product Details
  • ISBN-13: 9781236062666
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 88
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1236062663
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 172 gr

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