International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them. Fully Illus

Excerpt from International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them. Fully Illustrated and Containing Numerous Practical Examples and Their Solutions In this volume the principles underlying practically all central-energy, or common-battery, telephone systems have been clearly explained, diagrams of connections and the operation of nearly all independent and Bell central-energy systems are described. Central-energy main and branch exchanges and common-battery signaling telephone systems are also fully considered. Then follows an excellent treat ment of trunk, toll, and testing circuits; party-line systems; exchange wiring; and extension telephones. To meet the demand for sending both telephone and telegraph messages over the same circuits at the same time, a number of so-called simplex and composite telephone and telegraph systems have been developed and are fully illustrated and described in this volume. Finally, storage batteries and their care and use in telephone exchanges have been very fully considered. The utmost care has been taken to treat all the subjects in a manner most useful to those engaged in telephone exchanges and manufacturing companies. The method of numbering the pages, cuts, articles, etc. Is such that each subject or part, when the subject is divided into two or more parts, is complete in itself; hence, in order to make the index intelligible, it was necessary to give each subject or part a number. This number is placed at the top of each page, on the headline, opposite the page number; and to distinguish it from the page number it is preceded by the printer's section mark Consequently, a reference such as §16, page 26, will be readily found by looking along the inside edges of the headlines until §16 is found, and then through §16 until page 26 is found. 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.