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Astronomical Observations Made at the Observatory of Cambridge Volume 16

Astronomical Observations Made at the Observatory of Cambridge Volume 16


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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. 1850 Excerpt: ...the cross was obscured by haze, and was a little unsteady. After the reversion, the Sun having shone out, the cross became so unsteady, that it was necessary to defer the bisection till 5h in the afternoon, when it was still very unsteady and obscure. The collimator was shaken by wind, and altogether the circumstances were unfavourable. Illumination East. r. Mean of 6 readings, micrometer-wire coinciding with D 23,872 7 bisecting South mark 22,140 6 bisecting North mark 21,711 Illumination West. r. Mean of 7 readings, micrometer-wire bisecting North mark 25,94,4 8 bisecting South mark 25,318 6 coinciding with D 23,874 Reading for line of collimation by South mark 23,729 North mark 23,827 Reading for true line of collimation 23,778 Reading for coincidence with D 23,873 Hence as the micrometer readings increase in proceeding from the illumination end of the axis, after the reversion D was to the East of the true line of collimation by 0r,095. Consequently, the error of collimation of D, illumination West, is--1,"62, one revolution of the micrometer being 17,"06. The mean of all the wires was more Westward than D by 1,"02 (see p. ii.). Hence, taking account of the correction--0,"18 for diurnal aberration, Concluded error of collimation, Illumination West, =-1,"62 + 1,"02-0,"18=-0,"78, Illumination East, = + 1,"62-1,"02-0,"18= + 0,"42. These determinations are not adopted in the reduction of the transits, but were used, in combination with the following measures taken with the collimating eye-piece, in obtaining new values of the constants la--LNo and l --Le. (See page ix.) March 7, just before and after the reversion of the Transit, measures were taken with the collimating eye-piece, which gave t...


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Product Details
  • ISBN-13: 9781130397086
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130397084
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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