Excerpt from Manual of Wireless Telegraphy and Telephony The tremendous strides in wireless during the past ten years have necessitated a revision of this Manual. In the matter of improved apparatus the alternating current transformer has largely taken the place of the induction coil and the auto receptor has all but superseded the coherer receptor in practical installations, with the result that both the working and the efficiency of stations have been greatly improved. 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.