Publications of the Washburn Observatory of the University of Wisconsin Volume 6

Publications of the Washburn Observatory of the University of Wisconsin Volume 6

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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. 1890 edition. Excerpt: ...are, however, so discordant, both with the other determinations and inter se, that I do not consider them as entitled to any weight whatever and they are therefore omitted from the summary. Prof. Brown's observations give a sine flexure of +0/06 and Mr. Flint's, --0/80. Division Errors.--The division errors of the circle have been made the subject of prolonged investigation by Prof. Brown, Mr. Egbert and Mr. Flint. The details of this investigation will be reserved for another volume, but it may be stated here that the error of each ten minute diameter has been determined by Kaiser's method (Leiden Annalen, Bd. II); that these errors have been platted and a curve drawn through them from which there has been constructed a U table giving for each degree of declination the correction to be applied to the observed declination of the star. The curve is sufficiently smooth to allow of linear interpolation within a space of a degree without error exceeding the probable error of the corrections themselves. An inspection of the course of this curve among the plotted points shows that the average residual obtained by comparing all of these points with the curve is not far from 0/1, i. e. the probable error of an observed division correction is presumably not greater than this quantity and the probable error of a correction read from the curve is presumably less than this quantity. It should be noted in this connection that at the beginning of Prof. Brown's work the meridian circle was so adjusted that the same divisions come under the microscopes in observing the nadir in both positions of the circle, thus obviating the necessity for a special investigation of the errors of these lines as this error will be eliminated from the mean of observations, more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236887247
  • 9781236887245