Excerpt from The Principles of Electric Wave TelegraphAn enormous amount of research has been carried out in the last ten years on the subject of Hertzian Waves in their application to telegraphy, and the specifications filed in the Patent Offices in various countries bear record to the amount of ingenuity and thought that has been spent in the endeavour to utilize electric wave phenomena for this purpose.Some attempt has been made in this book to gather together a portion of this information, as far as it concerns the above technical application, and with the object of assisting the reader references have been given, as far as possible, to the original sources of information.A list of the chief patents granted in Great Britain for improve ments in wireless telegraphy has been added, which will probably prove of utility to the English reader.Invention is progressing so rapidly in connection with the subject, and the amount of work that has been done is so large, that any attempt to present an account of the subject must necessarily be imperfect in some respects.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.