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FOREWORD xiii of peculiar interest that line radio was developed by tech- nicians in government service. This, then, becomes a govern- ment contribution to the advancement of science. Radio even provides a means of communication for sub- marines. Strange as it may seem, a submarine can maintain constant communication whether submerged or afloat. Though it sounds absurdly impossible, it thus becomes possible to talk to an airplane high in the air from a submerged submarine. In spite of all these important applications, radio develop- ment is only in its infancy. The future holds great promise, especially in the radio transmission of power, through the use of directional transmission, perhaps at very low wavelengths, communication over great distances with low power trans- mitters, elimination of atmospheric disturbances familiarly called "static" and the development of a tremendous broad- casting system, both. governmental and private, covering all sections of the United States. I shall take this excellent opportunity to speak a word to the amateurs. As I stated previously, the Air Mail Service will begin an extensive night flying schedule in the near future. The Author, in this book, relates one instance where radio saved a large twin-motored air mail plane from destruction while in flight between Cleveland and Chicago, and amateurs in the immediate vicinity were partly responsible for this happy ending to a near disaster. I take this moment to again call attention to their excellent work. This incident is a key to the future, when the skies will be full of such airplanes, when there will be many opportunities for amateurs to lend the aid of themselves and their stations in such times of emergency. We look upon stations of this kind as a decided asset in our new ventures. I have called attention to these various phases of the radio science in the hope that it would bring the realization that in