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Published online by Cambridge University Press: 06 July 2012
I had added (at p. 140 of my paper on “Gaseous Spectra”) to the “small dispersion” account therein given of the above mentioned spectrum of luminous oxygen gas,—that two, if not four, of its very few and scanty lines appeared, when viewed with much higher dispersion, to be double; but that I hoped to give a more exact account of them, after completing some arrangements then in progress for increasing both the dispersion and magnifying power of my spectroscope.
page 423 note * That triplicity is indeed there broken in upon by a far stronger line, which Angström traces to sodium, (Na) ; but such cases of mere optical juxta-position are frequent in the crowds of lines in much of the solar spectrum, without any physical connection being supposed to be implied thereby.
