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Astronomical Observations Made at the Observatory of Cambridge Volume 8

Astronomical Observations Made at the Observatory of Cambridge Volume 8


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About the Book

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. 1836 Excerpt: ... fixed and one moveable wire is used alone; the wires being placed nearly 5' apart, and a division being brought to the fixed wire, the micrometer-wire is placed on the next division. In this manner the error h2 of each of the divisions is found with the accumulation which belongs to an arc of 15 spaces only instead of 45, as in the method previously used: and with greater ease and accuracy in every individual measure. The errors being thus found, and their signs changed, and 80" added to make them all positive (as before), the following table of corrections is formed. 57.20 25 30 35 40 45 50 57.55 58. 0 5 10 15 20 25 30 35 40 45 50 58.55 59. 0 5 10 15 20 25 30 35 40 45 50 59.55 60. 0 63.50 63.55 64. 0 5 10 15 20 25 30 35 40 45 50 64. 55 65. 0 It will be seen that a small part of the arc examined here had also been examined in the former method for the observations of Mars at opposition: and near the middle of the arc of 3. 45' the discordance is very sensible. This arises entirely, without doubt, from the accumulation of errors in the former method. The printing of the Volume had however proceeded too far, when the second examination was made, to enable me to avail myself of the more correct determinations. The eleventh and twelfth columns have the same meaning as in the Observations of Mars, &c.: and the thirteenth column contains the equivalent correction in sexagesimal divisions. One revolution of the micrometer is always considered = 33,"429; and the readings at coincidence are supposed to be as follows: On Jan. 16, a 0,005. The fourteenth column contains the correction for the position of the wires, which between Oct. 10 and Oct. 21 (as already mentioned) were misplaced in such a direction that a star passed apparently above the wire bef...


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Product Details
  • ISBN-13: 9781130563795
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130563790
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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