Handbook Of Telephone Services PDF Download

Excerpt from The Telephone System of the British Post Office: A Practical Handbook The acquisition of the telephone trunk lines by the State led to the design of a system of working which differs in many particulars from any previous System. Since the transfer many developments have taken place, and as no adequate description of the system existed, a series of articles dealing with it were undertaken by the writer of the present volume. These articles in their crude form proved to. have filled a distinct want amongst the employees of the Post Office - so many of whom, in one form or another, were for the first time brought into touch with telephony. The primary object of the articles was to describe in detail the trunk system; but it was considered desirable to give some account of first principles, and accordingly the transmission of speech, transmitters, receivers, and, in fact, telephone stations generally, were briefly described. The writer is aware that much of this has been described times without number, but his experience as a teacher leads him to believe that the inclusion of this matter will render the book useful to a larger circle of readers. The first eight chapters may be said to be introductory to the subject of telephony generally. The permanent current systems nextly receive attention, and their various classes of switch sections. After this follow special switches, such as transfer boards, record table switch sections, etc. A chapter upon inductive disturbances has here been interpolated with the object of rendering the subsequent chapter, dealing with the conditions under which superimposing is practicable, more intelligible. The writer begs to express the opinion that too much attention cannot be paid to the questions arising from a consideration of these chapters, and especially so to any whose lot it is to have anything to do with the testing and fault localisation of telephone circuits. 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.