This book provides a detailed description of the marine steam turbine as developed by Charles Parsons. The book includes practical instructions on how to operate and maintain the turbine, and also includes a description of the Denny Johnson patent torsion meter for measuring the transmitted shaft horsepower. The book is intended for engineers, mechanics, and students of marine engineering. 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.