Abstract
IN NATURE of February 13 there is a letter by Dr. C. G. Barkla and Mr. C. A. Sadler in which the authors divide the elements—according to the qualities of the secondary X-rays emitted by them—into four groups founded upon the atomic weights, without consideration of any other quality of the element. It may be of interest to mention that practically the same classification was given by me as early as 1896 in the Naturwissenschaftliche Rundschau (vol. xi., p. 485), and that this classification was also dealt with in a treatise published by Prof. Voller and myself in the Annalen der Physik und Chemie (vol. lxi., p. 88, 189 7). To this treatise there is added a table printed directly by the secondary rays of a great number of elements, and this shows not only the great difference between the elements of the different groups, but also the agreement in the behaviour of the various elements of the same group.
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WALTER, B. Classification of Secondary X-Radiators . Nature 77, 462 (1908). https://doi.org/10.1038/077462b0
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DOI: https://doi.org/10.1038/077462b0
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