Leipzig, Barth, 1893-94 Both in orig. printed yellow wrappers. 2 Offprints from Annalen der Physik und Chemie, Neue Folge. Band 50. and Band 52. Separat-Abdrucke. Ueberreicht vom Verfasser. pp. (625-)638 + (119-)131. Clean and fine.
Reference : 59175
First printing of these main papers in spectroscopy of the elements, where Rydberg predicts lines of definite wave-lenghts in the spectrum of one or the other element.
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