Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 231
The chief line in thespectrum of the corona is the one usually designated as 1474,and now known as the coronal line. It is seen as a dark line 208 ASTRONOMY. on the disk of the sun; and a spectroscope of great dispersivepower shows this dark line to be closely double, the lowercomponent being one… … 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…
Astronomy
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