Radiotelegraphy #261764

IT is hoped that this book may serve a useful purpose in enabling readers to' become acquainted with the principles and practice of radio-telegraphy. Some knowledge of electricity is essential, and, though it is impossible to thoroughly understand the phenomena without much handling of electric apparatus, an attempt is made in the first chapter to state as simply as possible the fundamental facts relating to electricity and magnetism; for until these are grasped it is hopeless to try to appreciate the mechanism of radiant waves. In the next two chapters electric vibra tions are first explained, and then the fundamental pheno menon of radio-telegraphy, the radiation of energy from a vibrating electric circuit.