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 138
ectrum which shows dark lines in place of thecharacteristic bright lines. We therefore infer that the sun is covered by an envelope.of gases, not so hot as the luminous clouds which form thephotosphere, and that these gases by their absorption producethe dark lines which we see. §174] SPECTRUM… … Fig. 33. — Reversal of the Spectrum. carbonate of soda and some salt of thallium upon the wick.We shall then get a spectrum showing the two yellow lines ofsodium and the green line of thallium, all bright, as in theupper of the two spectra. If now the lime light be startedbehind the flame, we shall…
Astronomy
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