Excerpt from Radiotelegraphy
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 vibrations are first explained, and then the fundamental phenomenon of radio-telegraphy, the radiation of energy from a vibrating electric circuit.
Hertz, who proved experimentally the existence of these radiant waves, worked for science and not for telegraphy. It remained for a host of inventors to adapt the newly-discovered phenomena to practical use. The waves, with which Hertz himself experimented, were too small, and in Chapter IV. the properties of the modified longer waves, used in practice, are enumerated.
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