Abstract
IN NATURE for November 20 Prof. Lyman reports his observation of a helium line at 1640.1, as well as a weak one at 1215.1, close to the strong one 1216, and refers them to orders 3, 4 in the series 4N{1/22-1/m2}. If the correct reading for the strong line is nearer the 1215.1, the whole series m=4 … 8 is found in his list of ultra-violet lines given in the Astro. Journ. (vol. xliii., p. 89, 1916). The following is the list of observed lines with deviations (obs.–calc.) from the calculated values, with N = 109720:—
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HICKS, W. A Helium Series in the Extreme Ultra-Violet. Nature 104, 393 (1919). https://doi.org/10.1038/104393a0
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DOI: https://doi.org/10.1038/104393a0
