Excerpt from A Popular Guide to Commercial Domestic Telephony In order that this may prove of service to those absolutely ignorant of Electrical Science, we find it necessary to explain some of the very elementary laws of Electricity and Magnetism, without knowledge of which it would not be possible to understand the technical expressions necessarily used. We trust that the effect of our efforts will be to enable those who have hitherto looked upon telephone work as some thing complicated and difficult, to lay themselves out for this class of work with confidence. For further and more detailed information we would recommend our readers to study the excellent works by Preece Stubbs, Sinclair Raphael, A. R. Bennett, F. C. Allsop, Poole, &c., in which collectively will be found exhaustive information, including descriptions of the most complicated exchange systems. 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.