Excerpt from Controllers for Electric Motors: A Treatise on the Modern Industrial Controller, Together With Typical Applications to the Industries
This volume consists of the series of articles originally published in the Electric Journal during 1917 and 1918, to which I have now added some new text and illustrations.
The object of this book is to bring the Industrial Controller Art to the attention of technical students, operating engineers, purchasers and users of electrical apparatus, in the hope that it will give them a good general idea of Industrial Controllers and explain their principles of operation. Illustrations have been used for the purpose of making the text clear. No attempt has been made to have these illustrations represent the various forms of commercial apparatus. This information can be obtained from trade publications.
Some of the chapters are elementary for the benefit of those not experienced in the art. No attempt has been made to cover every method of control, those selected being for the purpose of showing principles of operation. Most of the diagrams have been very much simplified for the purpose of clearness. Anyone attempting to repair or connect up a controller, with which he is not familiar, should obtain a diagram and instructions from the maker. It is not possible in a book of this kind to give complete diagrams of commercial control. It is hope, however, that this book will help in the understanding of such information.
In the application sections, the processes and methods of operation are described in some detail, as this information is always essential to a proper understanding of the control. Many controller troubles arise from the lack of complete information of this nature.
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