A popular history of astronomy during the nineteenth century (1902)
Clerke, Agnes M. (Agnes Mary), 1842-1907 · London, A. and C. Black · leaf 428
k in thespectrum of Sirius (separately printed for comparison), besides manyothers still more refrangible, as yet unidentified. Very significant,too, is the marked character of the great prominence lines H and K.The visual spectrum of the Nova was splendidly effective. A 1 Observatory, vol. viii.,… … -= oa <j fr. °> IT- § Is s — H 03 y. _= r- < 5-£ « i chap, xii STARS AND NEBULA 397 quartette of brilliant green rays, two of them due to helium, caughtthe eye; and they had companions too numerous to be easilycounted. The hydrogen lines were broad and bright; C blazed, asMr. Espin said,…
Astronomy
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