Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 147
theCorona. — A characteris-tic feature of its spectrumis a bright green line,generally known as the1474 line.1 This line was at first -supposed to be due toiron, and the coincidence was for a long time puzzling (sincethe vapor of iron is a very improbable substance to be foundat an elevation above… … Fig. 37.Corona of the Egyptian Eclipse, 1882. § 184] THE CORONA. 137 it was discovered that the line is really a close double. One ofthe two components of the dark line is due to iron, while theother, the true corona line, is due to some still unknown gaseouselement (probably lighter than…
Astronomy
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