Written by John R. Parker, this book is a comprehensive guide to the marine telegraph system, the United States telegraph vocabulary, and the telegraph signal numbers used by the British and French governments. The book is divided into three parts and includes numerous illustrations to aid in the understanding of the topics covered. This book is a must-have for anyone interested in the history of communication technology. 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.