The Spectroscopy of the extreme ultra-violet
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Theodore Lyman. The Spectroscopy of the extreme ultra-violet. London, Bombay, Calcutta and Madras. 1914. (135 pages) (Monographs on Physics).
In a splendid, clearly and thoroughly written monograph, Lyman endeavors to illuminate in general outline the whole field of the study of short ultraviolet rays; in the first part he gives general indications concerning the methods of investigating radiation in the ultraviolet region (photography, the photoelectric element, thermal effects), and then gives general information on the results obtained for the absorption of solids and rarefied gases. In the second—the larger—part (pp. 29–133), Lyman gives a detailed description of the methods developed by Schumann and by himself; the description of the methods is accompanied by valuable technical instructions that make it possible to reproduce the apparatus in practice. Subsequently, Lyman gives the results of observations of absorption in the extreme ultraviolet spectrum, of observations of the emission of gases and solids in the same region, and of photoelectric effects. The book includes a valuable list of all Schumann’s works and a detailed bibliography of the subject.
P. Lazarev.