This lecture explores the physics behind the turning powers of ships. White provides a detailed analysis of the various factors that affect a ship's ability to turn, from its hull shape to its propulsion system. With detailed diagrams and mathematical calculations, this work is an essential resource for naval architects and marine engineers. With its accessible language and engaging style, this lecture is an accessible introduction to the science of ship design. 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.