This is an expert's succinct description of how electricity was discovered, and electronic theory as it concerns the invention and operation of the above devices. This volume provides a useful basic but not over-simplified course that traces the historical identification of the unique qualities inherent in a flow of electronics and modifications of it from the beginnings to the development of the transistor. It touches all the high spots including discussion of the wireless, the audion and pentude tubes, superhetrodyne, etc., and the men who made them possible. The book is lucid, offering many clean diagrams that help make clear upon what the efficiency of all the devices depends. For the serious student who wants to know the whys and wherefores of basic circuits as well as the enterprising tinkerer in the home.