How Your Radio Works, by Ian Batty. 130 pages, 2nd Edition, revised and expanded. Cost $20.00. This book describes the development and theory of the radio valve. It also describes all kinds of circuit designs used in domestic radios, from two-valve “pocket sets” to car radios, FM receivers, shortwave radios, and everything else in between. It also contains detailed fault-finding procedures for every stage of a superhet radio, so it’s a *must* for the bookshelf.