Astronomical, Magnetic and Meteorological Observations Made at the United States Naval Observatory Volume 1-3

Astronomical, Magnetic and Meteorological Observations Made at the United States Naval Observatory Volume 1-3

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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. 1873 edition. Excerpt: ...it to sidereal time determined by myself at the meridian of the transit circle. 7" is the time indicated by the clock at the instant for which the correction is required, and the quantities after the sign + are approximately the probable errors. Table III.--Corrections to the Kessels Clock. I-J Y WASHINGTON AND ST. LOUIS. 15 St. Louis Observations.--The observations for time at St. Louis were made by Pro feasor William Eimbeck, and are given in Table IV. The first column contains the date. The column uLamp" gives the position of the axis of the transit instrument; E. signifying that the lamp was to the east, W. that it was to the west. The column "No. of Wires" gives the number of wires over which the transit of the star was observed. The field of view of the instrument contained nine vertical wires, separated by intervals of about 15 seconds of time, but as a rule only the middle seven wires were used, and all observations were made by the eye and ear method. The column "Star" does not require any explanation. The column "Time of Transit over Mean of Wires" contains the time of transit over an imaginary wire situated at the mean of the standard set of seven wires. For stars not observed over all the wires of that set the time of transit over the mean wire has been deduced from the observed times of transit by the application of the necessary corrections. The column "6" contains the observed values of the level constant, each of them being derived from two readings of the spirit-level, one made with it in the direct, the other with it in the reversed position. The level is of the striding form, and each division of its scale is equal to O."oq. The columns...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123679768X
  • 9781236797681