Published in the late 19th century, this book is an early example of technical writing, explaining in detail the operation of the pioneering air brakes developed by George Westinghouse for use in railroads. While the subject matter may seem esoteric to modern readers, this book provides a fascinating glimpse into the engineering achievements of the past. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.