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A set of three conditions which are necessary and sufficient for the RC: RL decomposition of a 4th-order polynomial is derived. The conditions are expressed in terms of the Qs and the coefficients of each quadratic factor, and the method thus offers a computational advantage over a previous method.

IN following the standard set in this series of monographs, the author gives us a tidy, critical, and slightly historical account of the basis of operational calculus as devised by Oliver Heaviside. It should be a great help to students, because it is in the initial stages that the difficulties are most severe. There is a slight parallel between Heaviside and the author, for the latter, without paper qualifications, has risen to be an effective exponent of his master's subject, a corner of the field of mathematics which is not densely populated by authors. Heaviside's Electric Circuit Theory By H. J. Josephs. (Methuen' Monographs on Physical Subjects) Pp. viii + 116. (London: Methuen and Co., Ltd., 1946.) 4s. 6d. net.

The relative circuit gain of two configurations of common-emitter antisaturation-feedback circuit is derived as a function of circuit parameters.