Excerpt from Electrical Instruments in Theory and Practice During the course of many years lecturing and working With instruments we have found the necessity for some work dealing With the theory beyond merely the first terms. It is hoped this book will meet With the approval of students in the higher classes, and of engineers. In many cases, and especially in the section on electric supply meters, the results of numerous experiments are compared With theory. The theory of the induction meter is extremely complex, and the explanations given are sometimes quite erroneous. We hope the views we set forth Will prove useful. The instruments Which have been selected are merely typical of those in use, and we propose completing the work by dealing with oscillographs, ondographs, and many alternating current instruments both theoretically and experimentally in another volume. 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.