Astronomical and Magnetical and Meteorological Observations Made at the Royal Observatory, Greenwich, in the Year

Astronomical and Magnetical and Meteorological Observations Made at the Royal Observatory, Greenwich, in the Year

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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. 1859 edition. Excerpt: ... set down 29ln-57..37. 38. Very faint; cloudy. The microscopes were read by IIB and T. The integral numbers of revolutions for Microscope-micrometers B, C, D, E, P, will be inferred from that for A, by remarking that the difference of readings for the several micrometers is small; being slightly the greatest. For Tabular Equivalents of Microscope-micrometers it is assumed that the value of the screw of each micrometer is sensibly the same; and that, for the mean of readings of the six micrometers, 4' 902 corresponds to an arc of 5'. The Refractions to 82o Zenith Distance are computed without alteration from the Tables in the Appendix to the Greenwich Observations for 1853. From 82o to 8-, Z. D., the log. refractions, computed from their appropriate tables in that Appendix, are diminished by-ooioo. From 85 to 900, the mean refractions of the Fundamenta have been employed, the log. mean refraction being diminished by 00066, and the other quantities being taken from the Appendix to the Observations, 1853. 1. Computed distance of cusp from N.L., 20. 43'; correction applied, --o"'oi. 2, 34 The reading of the telescope-micrometer has been diminished one revolution. 14. Double; very unequal. The larger star was observed. 26, 27. Very tremulous. 30, 31. The microscopes were read by H and T. 3, 4 The microscopes were read by J and . 25. After this observation a thick fog covered the sky. 27. Computed distance of cusp from N.L., 20. 49'; correction applied, --o"-oi. 33. 34-Very cloudy. The microscopes were read by L and . The integral numbers of revolutions for Microscope-micrometers B, C, I), E, F, will be inferred from that for A, by remarking that the difference of readings for the several micrometers is...show more

Product details

  • Paperback | 114 pages
  • 189 x 246 x 6mm | 218g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633423
  • 9781236633422