Excerpt from Principles of the Telephone, Vol. 1: Subscriber's Apparatus Although details qof construction are not given to any extent it was the purpose Of the authors to clearly set forth the principles that underlie good construction. The main emphasis, however, is placed upon the principles of operation of different types or makes of subscribers' apparatus, together with a discussion Of methods Of locating faults and their correction. This is the first part of the course and 1s mainly confined to subscribers' apparatus. The two other parts to follow, which are in preparation, will treat Of central Office equipment and out side construction. 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.