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Daytime and Evening Exercises in Astronomy, for Schools and Colleges

Daytime and Evening Exercises in Astronomy, for Schools and Colleges


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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. 1912 Excerpt: ...length of the pendulum. One turn of the micrometer screw, which lengthens or shortens the pendulum, changes the rate of the clock thirty-three seconds in twenty-four hours, or 1.4 seconds an hour. 2. The chronometer is by William Bond & Son of Boston. It ticks the half second and can be made to break an electrical circuit every half second. To compare the clock and chronometer, set down the time of the clock at the end of some minute, and before the minute is up, with eye on the chronometer, listen to the ticks of the clock, and at the sixtieth tick note the time on the chronometer to the half second. Thus take four or five observations at intervals. Then reverse, and read the clock at the last tick for the minute of the chronometer. For a calculation of the comparative rates of the clocks, more observations are needed than students could well take; therefore, from the accompanying list, find how much the clock is gaining on the chronometer each hour. Proceeding Following Use of clock to tell the precise time of some event. In watching the passage of a star across the field of a transit instrument by the "eye-and-ear method," the observer wishes to record the precise time of the star's crossing each wire of the reticle (Fig. 16). This requires the doing of several tilings at once--watch-s ing for the bisection of the star by the wire, listening and counting the ticks of the clock, and putting down the second of passing the wire. Practice' may be given by recording the time of a series of taps and finding the interval between them.2 Let one tap with apiece of wood while others listen for the ticks of the chronometer, and put down the second of the tap. Practice until it can be correctly done. Record in columns headed as follows: Ti M E Of Taps ...


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Product Details
  • ISBN-13: 9781153798655
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1153798654
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr

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