Excerpt from An Elementary Manual of Radiotelegraphy and Radiotelephony: For Students and OperatorsIn preparing for the press this third edition the Author has added such new matter as is necessary to bring the information up to date and to correct misprints or errors, but the general purpose Of. The book has not been otherwise altered or its scope as an elementary manual enlarged. It is hoped, therefore, that its utility as an introduction to larger treatises will still be.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.