The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 340
f breadth. The greater breadth of the lines seemsto point rather to a condition of the gases in which their power of absorptionembraces for each line an increased range of wave-length. That the powerof absorption of gases varies in this respect is shown by the increase ofbreadth which some of the… … Fig. 42.—Spectrum of a Sun-spot. in the range of its power of absorption on light passing through it should takeplace under similar conditions of density and temperature. The phenomena may point to an increase of density in the vapours existingwithin the umbra. Such a state of things would…
Astronomy
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