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 224
orms aregiven in Figs. 218and 219. Their spectrum Fig. 218. is usually very simple, consisting of the four lines of hydro-gen and the orangeDl: hence the ap-pellation hydroge-nous. Occasionallythe sodium andmagnesium linesalso appear, evennear the tops ofthe clouds. 200.… … 202 ASTRONOMY. miles ; but occasionally they rise far higher than even thelargest of the quiescent protuberances. Their spectrum isvery complicated, especially near their base, and often filledwith bright lines. The most conspicuous lines are those ofsodium, magnesium, barium, iron, and titanium:…
Astronomy
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