(1) Applied Magnetism (2) Einföhrung in die Elektrizitotslehre

Abstract

(1) DR. WALL gives a good general survey of the subject of applied magnetism and of the theoretical aspects of certain of the questions raised by recent developments of magnetic practice. The bulk of the work is devoted to the problem of obtaining practical control over the magnetic behaviour of the materials used in practical engineering work and to a description of the methods employed in testing the magnetic behaviour of such materials; and the author's own work and experience enable him here to give a tolerably complete, if not always a critical, account of the present state of our empirical knowledge of a now very extensive subject. The treatment of the theoretical parts of the subject is less happy, being both incomplete and, in places, confused; but as this side of the subject is still in a state of flux, this cannot be regarded as detracting seriously from the merits of an otherwise good book. (1) Applied Magnetism. By Dr. T. F. Wall. Pp. 262. (London: Ernest Benn, Ltd., 1927.) 28s. net. (2) Einföhrung in die Elektrizitotslehre. Von Prof. R. W. Pohl. Pp. vii + 256. (Berlin: Julius Springer, 1927.) 13.80 gold marks.