In this book, Walker details the complex process of providing heating and ventilation on board ships carrying perishable goods. He covers topics such as insulation, cooling systems, and air circulation in a way that is accessible for readers with limited technical knowledge. Students of marine engineering and anyone interested in the history of transportation will appreciate the insights contained in this volume. 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.