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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
Authors/Creators:	Biggs, Alfred Barrett
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
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
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.
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