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 214
Fig. 210. shown in Fig. 210. This thickening of the lines shows thatthe absorption is taking place at a greater depth. New linesand shadings often appear, which indicate, that, in the coolernucleus of the spot, certain compound vapors exist, which are … These lines and Fig. 211. dissociated elsewhere on the suns surface,shadings are shown in Fig. 211. It often happens that certain of the spectral lines are re-versed in the spectrum of the spot, a thin bright line appear-ing over the centre of a thick dark one, as shown in Fig. 212.These reversals…
Astronomy
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