High Frequency Alternating Currents

THIS is a remarkably good book. “No claim is made for originality of most of the material, for the presentation of new results, or for an exhaustive treatment of the subject matter.” This disclaimer in the preface is in exact accord with our estimate in reading through the text. Moreover, it is not improbable that a reader depending on this book for all his knowledge of the subject would fail to recognise a wireless set when it was put before him. Yet the very essence of quantitative high-frequency work is set down here in a well-ordered array, with just that orientation and emphasis which many of us have had, painfully and with labour, to develop in default of such guidance as the authors now offer to our happy juniors. There is a measured neglect of much of the secondary matter that has cumbered and dis-balanced preceding textbooks; there is no running away from detailed expansion in cases where a superficial treatment has in many previous texts left the student with a stock of unjustified certainties to unlearn.High Frequency Alternating Currents.By Knox McIlwain J. G. Brainerd. Pp. xiii + 510. (New York: John Wiley and Sons, Inc.; London: Chapman and Hall, Ltd., 1931.) 30s. net.