Abstract
THE spectra of helium and hydrogen have acquired considerable importance in view of the recent experimental researches of Prof. Fowler and the theoretical investigations of Dr. Bohr. Before the appearance of Fowler's investigation the only hydrogen series known terrestrially were the diffuse series, consisting of the Hα, Hβ, &c, lines, and the infra-red series predicted by Ritz, two members of which (18751.3 and 12817.6) were observed by Paschen. However, by passing a strong condensed discharge through mixtures of helium and hydrogen, Fowler was able to photograph four members of the principal series, the strongest line of which is at 4686.
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