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Report of spectroscopic observation of the twilight glows during February and March, 1884

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Biggs, Alfred Barrett (1884) Report of spectroscopic observation of the twilight glows during February and March, 1884. Papers & Proceedings of the Royal Society of Tasmania. pp. 202-203.

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Abstract

Referring to the diagram, the regular solar lines are distinguished as usual—A, B, C, etc. The features to which I wish to draw particular attention are distinguished by numerals—1, 2, 3, etc.—1 and 2 being the most remarkable. I have adopted Roscoe's frontispiece scale—A being at 20, B at 28, C at 34, and D at 50, etc. The diagram gives, as nearly as I can show it, the appearance of the spectrum near the horizon when the "glow" is moderately strong. By far the most prominent feature in this spectrum is the line or band (2) at scale 41. I have noticed that the deeper the glow the broader and deeper does this band become. The line (1) at 37 also comes into great prominence at such times, fully equalling, and sometimes exceeding C in intensity. This line (1) is, however, very persistent, continuing more or less conspicuous throughout the day. (3) At about 44 is a faint line, which is scarcely perceptible in the twilight. (4) Is a well-known vapour-band, always more or less conspicuous about the horizon. (5) On the edge of the green is a very broad band, shading off a good way into the green and somewhat resembling a shadow. Note: (diagram is not included in this report)

Item Type: Article
Keywords: Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records
Journal or Publication Title: Papers & Proceedings of the Royal Society of Tasmania
Page Range: pp. 202-203
Additional Information: In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.
Date Deposited: 28 Nov 2012 03:48
Last Modified: 18 Nov 2014 04:45
URI: http://eprints.utas.edu.au/id/eprint/15562
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