Astronomical and Meteorological Observations Made at the United States Naval Observatory During the Year 1869

Astronomical and Meteorological Observations Made at the United States Naval Observatory During the Year 1869

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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. 1872 edition. Excerpt: ...Company, but about 1 p. m. will be the most desirable hour. At the conclusion of the telegraphic work of each day, the time of exchanging signals on the day following will be agreed upon. 3. Signals will be exchanged in the following manner: The officer at Syracuse will ask the pfiicer at Malta if everything is ready, and, upon receiving an affirmative reply, he will wait until his chronometer indicates 50 seconds, and then he will make a rattle with the key b, Fig. 6, of his apparatus. This rattle will consist of ten or fifteen dots made at the rate of about five per second. Next he will make a series of taps on the key b, in exact coincidence with the beats of his chronometer at o, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, o, 1, 5, &c, seconds, and this he will continue for three minutes, ending at seconds. Then he will pause for five seconds, and finally finish with a rattle; after which he will record the hour and minute of the last tap before the rattle. As soon as the officer at Malta hears the first rattle of the officer at Syracuse, he will start his recording apparatus, if it is not already running, and will commence making taps on the key g of his instrument, in exact coincidence with the beats of his chronometer, and at intervals of one second; taking care to mark the beginning of each minute by omitting the tap corresponding to seconds of the chronometer. This will be continued until the arrival of the second rattle from Syracuse, when he will cease tapping, and will record the hour and minute corresponding to the last tap which was omitted before the arrival of the rattle. He will then notify the officer at Syracuse whether or not his signals have been properly received. If they have not been, they will be...show more

Product details

  • 12-17
  • Paperback | 156 pages
  • 189 x 246 x 8mm | 290g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236546067
  • 9781236546067