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Excerpt from Thermionic Tubes in Radio Telegraphy and Telephony The thermionic vacuum tube or valve has, within the last few years, become such an important feature of wireless practice and development that modern radio communication may almost be said to be the application of this versatile device to the reception and transmission of wireless signals. The present book has been written with a view to providing in a single volume an account of the practical development of the vacuum tube and its innumerable applications. An attempt has been made to arrange the matter in a logical manner, and also to give historical details of interest. Every attempt has also been made to give references to the work of those who have developed the science by their inventions or scientific contributions. While writing from a practical experience of nearly all the matter contained in this volume, the Author has taken the fullest advantage of the work of others, with a view to making the book as comprehensive and detailed as possible. A great many references are given, and if any which should have been given are omitted it is due solely to the large size of the volume. In this connection, great difficulty has been experienced in allocating the credit for different developments on account of the absence of international exchange of information. Unless information is freely circulated by publication, misunderstandings as to the rightful credit for inventions are bound to arise. Nevertheless, the Author has made a thorough search of technical literature and patent specifications on the subject with a view to obtaining a correct perspective of the real work of development. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.