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เนื้อหาย่อ : This volume is intended primarily for use at the "technical institute" or semi-professional level for the training of electronic technicians. It is the cutgrowth of courses given by the author at the United States Coast Guard Training Station at Groton, Connecticut, and presently being taught at New York City Community College. Two outstanding features are claimed for this book. First is the styling the author has used the same conversational or lecture style th successful in his previous texts. The book is easy to read and stimulating in its direct personal approach as contrasted to pedagogical and heavy third-person presentation. Second, the emphasis is on concepts and not on mathematical derivations. Where mathematics must be included, it is limited to algebra and basic trigonometry. Prerequisite to the understanding of this volume is a good foundation in direct-current fundamentals, background in the principles of algebra, and a basic knowledge of elementary trigonometry. Prerequisite or co-requisite, a course in alternating-current fundamentals is strongly recommended. As the title of this book implies, this is a tool subject and not a study of circuit applications. The student of eiectronics should know the char- acteristics and limitations of the various types of tubes and semiconductors before he can appreciate their selection and application to the many va- rieties of circuits for which each is suited. Therefore characteristics are presented and explained per se. Mention is made as to the possible circuit applications of each type discussed but, in general, no actual circuits are presented. Circuity at this point would be an error of digression and furthermore could not be complete. For example, under "diodes," power-supply recti- fer circuity might be included. But such a discussion would be incomplete unless power transformers, filter circuits, doublers, triplers, etc., were also included. But rectifiers need not be tubes. They could be of the metallic