Abstract
No sweeping changes appear to have been made in the “Text-book of Physics,” edited by Prof. A. Wilmer Duff, since the last edition, referred to in NATURE of March 15, 1917, p. 41, was published. The editor states in his new preface that “students of college Physics should have some acquaintance with such new and live topics of scientific, and even popular interest” as wireless telegraphy and telephony, sound-ranging, submarine detectors, the diffraction of X-rays, the instruments used in aeroplanes, and the principle of relativity, but with the exception of the paragraphs dealing with wireless telegraphy, the information afforded by the additional matter is of little value. Many of the illustrations, particularly those showing actual apparatus, are of a sketchy type.
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