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Annales of the Dudley Observatory Volume 1

Annales of the Dudley Observatory Volume 1


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About the Book

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. 1866 edition. Excerpt: ...charts will at once show which is the planet, provided it is included within those limits; when, the Ephemeris being corrected, it can be observed on the meridian in the usual way. This has been thoroughly tested in finding the old Asteroids, where the error of the Ephemeris has been considerable. In our ordinary work, as we observe all stars visible, the limit being 13-14 magnitude, it is usually impracticable to observe a zone of greater width than 10' or 12', and within these limits it is not unusual to find more than 200 stars in one hour of right ascension. In case we wish to extend our observations over more than one hour of right ascension, we loosen the clamp screw (g), fig. 1, and slide the whole apparatus carrying the pencil, on the post (e); the end of the connecting rod (/) being raised up and dropped on another pin. These changes can all be made in less than one minute. From the comparison of the positions given by the chart with those found by the declinometer, the mean error on the chart position is found to be less than the one-tenth of a minute of arc. In the prosecution of zone work, these charts have been found of great value in correcting doubtful observations, without the necessity of re-observing the zone. In case a wrong minute is entered by the assistant charged with taking down the declinometer readings and other remarks, on comparing with the chart we readily make the necessary corrections. The use of this apparatus in nowise interferes with our work for exact positions, since we have found the mean error of our observations to be the same whether the stars were charted or not. Our work during three years' experience has demonstrated the practical utility of the apparatus.' If for any purpose we desire a map of...


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Product Details
  • ISBN-13: 9781230179100
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1230179100
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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