Abstract
The Clock Rate. THE proper regulation of this clock error and consequent “trail” of the spectrum across the plate parallel to itself are essential to the success of photographs taken by the objective prisms. The spectrum of a bright star must obviously be made to trail more quickly than that of a fainter one, and a shorter exposure is sufficient. Since for the same clock error, and in the same time, a star near the pole will give a shorter trail than one nearer the equator, declination must also be taken into account. Keeping a constant clock error, equal widths of spectrum for stars of different declinations may be obtained by lengthening the time of exposure for stars away from the equator, but in that case, the stars near the pole would be over-exposed in relation to those nearer the equator.
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References
Monthly Notices, vol. li. p. 43, 1890–91.
NATURE, vol. xlii. p. 303, 1890.
Roy. Soc. Proc., vol. xliii. p. 150.
Lockyer and Roberts-Austen, Roy. Soc. Proc., 1875, p. 344.
Roy. Soc. Proc., vol. xlv, p. 382.
Monthly Notices, vol. xlviii., p. 360.
Ibid., vol. xlix. p. 124.
Roy. Soc. Proc. vol. xliv., pp. 33–43.
Ibid.
Subsequent eye observations by myself and Mr. Fowler seemed to leave no doubt as to the presence of these bright carbon flutings (Roy. Soc. Proc., vol. xlvii. p. 40). Dr. Copeland had previously made important observations of "Nova" Orionis with reference to this point (Monthly Notices, vol. xlvi. p. 112), and he identified one of the bright bands as "the great hydrocarbon band seen in the spectrum of every comet that has been examined under favourable circumstances." Referring to his observations of Orionis, Mr. Maunder ("Greenwich Spect. Observations," 1889, p. 22) states that "the carbon band at 5164 was coincident (within the limits of observation with this dispersion) with the bright space towards the blue of Dunér's band 7."
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LOCKYER, J. The Sun's Place in Nature1: XI. Nature 52, 446–450 (1895). https://doi.org/10.1038/052446a0
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DOI: https://doi.org/10.1038/052446a0
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