File:Astronomy for the use of schools and academies (1882) (14763935932).jpg

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Identifier: astronomyforuseo00gill (find matches)
Title: Astronomy for the use of schools and academies
Year: 1882 (1880s)
Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910
Subjects: Astronomy
Publisher: New York : Potter, Ainsworth, & Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 228. sometimes traced with the spectroscope to an elevation ofnearly twenty minutes above the moons limb, and the hydro-gen lines nearly as far; and the lines were just as strongin the middle of a dark rift as anywhere else. The substance which produces the 1474 line is unknownas yet. It seems to be something with a vapor-density farbelow that of hydrogen, which is the lightest substance ofwhich we have any knowledge. I can hardly be an alio- ASTRONOMY. 209 tropic form of any terrestrial element, as some scientists havesuggested: for in the most violent disturbances in prominencesand near sun-spots, when the lines of hydrogen, magnesium,and other metals, are contorted and shattered by the rush ofthe contending elements, this line alone remains fine, sharp,and straight, a little brightened, but not otherwise affected.
Text Appearing After Image:
Fig. 22Q. For the present it remains, like a few other lines in the spec-trum, an unexplained mystery. Besides bright lines, the corona shows also a faint continu-ous spectrum, in which have been observed a few of the moreprominent dark lines of the solar spectrum. This shows, that, while the corona may be in the maincomposed of glowing gas (as indicated by the bright linesof its spectrum), it also contains considerable matter in such 2IO ASTRONOMY. a state as to reflect the sunlight, probably in the form of dustor fog. V. ECLIPSES. 205. The Shadows of the Earth and Moon. — Theshadows cast by the earth and moon are shown in Fig. 235.

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