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    THE style of this book is lively and spirited and the information conveyed is clear and accurate. It is meant for the information and guidance of officers and men of H.M. fleet, and the editor is to be congratulated on making the subject so interesting. The modern theory of electricity is first described, and so the theory of thermionic tubes follows very convincingly later on. Resonance is first described analytically and then illustrated by what happens in daily life. We are told to “walk across a room carrying a cup of tea, and note …” The “jar”—the Service unit of electrostatic capacity—which equals the 900th part of the microfarad, is much in evidence and so also is the “mic” (the microhenry). W/T and R/T seem to be the contractions used in the Navy for wireless telegraphy and radio telephony respectively, and this book proves that they are very convenient.

    Admiralty Handbook of Wireless Telegraphy, 1925.

    Prepared by Capt. W. G. H. Miles. Pp. viii + 547. (London: H.M. Stationery Office, 1925.) 5s. net.

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