INTRODUCTIONBy Michael I. Pupin, Ph.D., Sc.D., LL.D.Professor of Electro-mechanics, Columbia University; Fellow, American Institute of Electrical Engineers, and American Association for the Advancement of Science.No art has ever made so rapid a progress as has the Radio Art. Starting about a quarter of a century ago with modest beginnings, employing most elementary means of exciting motions of electricity, it is today one of the most beautifully equipped among the electrical arts. The equipment is the fruit of scientific invention, research, and development achieved during the recent years of the still young life of the Radio Art, and this equipment is so simple that even people with very modest scientific training can handle it effectively. Hence the wonderful success of radio broadcasting.It is just eighty years since Joseph Henry showed at Princeton, that electrical motions are, under certain conditions, oscillatory, and that the effects of these oscillatory motions are tranAbout the Publisher Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion, History, Folklore and Mythology.Forgotten Books' Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the difficult to read text. Read books online for free at www.forgottenbooks.org