Excerpt from Modern Illumination Theory and Practice: A Handbook of Practical Information for the Users of Electric Light, Architects, Contractors and Electricians The aim throughout has been to provide a thorough practical guide containing all the information needed to the successful installation of good illumination in such a manner as to be readily intelligible to all concerned in such work. The thanks of the authors are due to Mr. James J. Dolan for assistance and helpful suggestions. 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.