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## 1 I8 CURRENT '].'OPICS. rays shows a nlore rapid ahatelncnt of tile atomic vibrations to which they are due, than tbe arc rays. Even the most intense rays, H and K, do not last as long as some weaker arc rays. The ray 37o6, with an intensity of m, has the shortest duration of all the rays. The exmnination of calcimn, containing traces of Sr, Mg, A1, and 5In, gives these results : Always distinguishing between arc rays and spark rays, and granting that the duration of a ray depends on its intensity, the duration of strontimn rays is far greater than that of calcium rays. On the other hand, the rays of rmgnesium are relatively shorter tban the corresponding rays of calcium. The two Muminum rays between H and K have almost normal duration, while the triple rays of manganese show a greater duration than the equally intense calcium rays. It follows from these data that the observation of the relative duration of spectral rays might, in certain conditions, give useful indications in the analysis of substances containing unknown inlpurities.

Who reads Composition of Greek Vases?

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0016-0032)

Published

1911

Language

EN

Field

Engineering (Physical Sciences)