FRONTISPIECE.-An Amateur's Set Heard Over a 500-Mile Range. I. K. W. Station Built by Mr. Ralph Batcher, at Toledo, Iowa, with the Assistance of the 1916 Edition of this Book. EXPERIMENTAL WIRELESS STATIONS Their Theory, Design, Construction and Operation INCLUDING WIRELESS TELEPHONY, VACUUM TUBE AND QUENCHED SPARK SYSTEMS. A COMPLETE ELEMENTARY COURSE OF INSTRUCTION IN AND AN ACCOUNT OF SHARPLY TUNED MODERN WIRELESS INSTALLATIONS By PHILIP E. EDELMAN, E.E. SCIENCE NEW 1928 EDITION A NEW BOOK FROM COVER TO COVER WITH ENTIRELY NEW ENGRAVINGS. REVISED, ENLARGED AND RESET EDITION, SHOWING ALL RECENT IMPROVEMENTS FULLY ILLUSTRATED NEW YORK THE NORMAN W. HENLEY PUBLISHING COMPANY 2 WEST 45TH STREET Copyright, 1920 and 1922 by THE NORMAN W. HENLEY PUBLISHING COMPANY COPYRIGHT, 1912, 1914, BY PHILIP E. EDELMAN ALL RIGHTS RESERVED PRINTED IN U. S. A. All illustrations in this book have been specially made by the HARVARD COLLEGE LIBRARY { ། PREFACE TO THE 1922 REVISED AND ENLARGED EDITION During the recent World War, the earlier editions of this book were extensively used in the United States and Allied Training Camps, and were found to be readily understandable text for beginners in the art of Wireless Communication, who wished to start with the elements and continue thoroughly. The readers of this book are assumed to have some knowledge of the fundamentals of electricity and mathematics. The knowledge of these branches need not be very extensive but when they have finished this book they will find themselves well advanced in the study of a fascinating subject. From the standpoint of operation, the best modern practice is presented in such simple language as to be well within the scope of the average reader. The basic principles of radiocommunication, involving the theory and mathematics of the subject, are given in considerable detail, so that they can be followed consecutively by the reader. There is plenty of room in radio work for the exercise of individual ingenuity, and this book will enable the reader, while exercising such ingenuity, to reach results without depressing failure. There is an army of wireless operators in all parts of this country, many of which figure as amateurs. |
