Excerpt from The Management of Electrical Machinery Since the appearance of the original edition in 1892, one com plete revision of this book has been made and corrections introduced from time to time. The rapid progress of electrical engineering has now brought about changes so radical that another thorough revision is necessary. The arrangement and object of the book remain the same, but much matter, more or less obsolete, has been eliminated. For example, constant-current motors are no longer used and various types of constant-current machines have lost some of their prominence compared with many modern examples of electrical apparatus; nevertheless a large number of, these machines are still in use, so that considerable matter relating to them is retained in the present edition and may have renewed importance due to the introduction of flaming arcs. To a large extent direct connection has taken the place of belting, and the maximum as well as average size of electrical machines has greatly increased. These changes are only partly true of motors, the use of belting and motors of moderate size being still common practice. For that reason it is now necessary to consider the two classes separately in some respects. A large amount of new and amended material has been introduced, such as the management of alternating-current generators and motors both single and polyphase, also that of railway motors. In the preparation of this new edition a great deal of the work has. Been done by Morton Arendt, e.e., of the Electrical Engineering Department of Columbia University, who has rendered much valuable assistance in the obtaining and arrangement of new ma terial, illustrations and data, also in the labor of proof-reading. 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.