The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 214
shown in Fig. 2to. 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 … Fig. 211. dissociated elsewhere on the suns surface. These lines andshadings 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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