The A B C of vacuum tubes in radio reception; an elementary and practical book on the theory and operation of vacuum tubes as detectors and amplifiers. Explains non-mathematically the fundamental principles upon which all vacuum tube circuits are based. Includes practical circuits and practical questions and answers. It is written especially for the beginner. All electrical and radio terms are fully explained
An introductory technical manual on vacuum tubes as radio detectors and amplifiers, written by Elmer Hugh Lewis for beginners and published by Norman W. Henley in New York in 1922. The plates are line-drawn circuit schematics on tinted stock, with hand-lettered labels, coils, batteries as stacked bar symbols, triode tubes drawn as pointed filaments, rheostat zigzags, and dashed signal paths that can be lifted as diagram vocabulary or pattern elements.
