Summary From measurements of the dispersion of potassium vapour in the regions of the first and second doublets of the principal series it is shown that the ratio of the numbers of resonating electrons corresponding to the two doublets is 110 to 1, and does not depend upon the density of the vapour. The corresponding measurements of this ratio for the individual lines of each doublet are 1·995 to 1 for the red doublet, and 2·046 to 1 for the violet doublet.
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V. K. Prokofiev (1927) studied this question.