This two-volume set is a comprehensive guide to mechanical engineering and metal trades in the early 20th century. Compiled from the pages of Mechanical World and Metal Trades Journal, the book provides detailed information on a wide range of topics, including machinery, iron casting, electrical engineering, and more. With numerous illustrations and diagrams, the book is a valuable historical resource for engineers, makers, and users of machinery.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.