Abstract
IN my early observations of the spectrum presented by the gaseous nebulæ, the spectroscope with which I determined the coincidence of two of the bright lines respectively with a line of nitrogen and a line of hydrogen, was of insufficient dispersive power to show whether the brightest nebular line was double, as is the case with the corresponding line of nitrogen.
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On the Spectrum of the Great Nebula in Orion, and on the Motions of some Stars Towards or from the Earth* . Nature 6, 231–235 (1872). https://doi.org/10.1038/006231a0
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DOI: https://doi.org/10.1038/006231a0
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