[Transcriber's Note: Bold text is surrounded by =equal signs= and italic text is surrounded by _underscores_.] WAR DEPARTMENT OFFICE OF THE CHIEF SIGNAL OFFICER MANUAL No. 6 VISUAL SIGNALING SIGNAL CORPS UNITED STATES ARMY 1910 [Illustration] WASHINGTON GOVERNMENT PRINTING OFFICE 1910 WAR DEPARTMENT, Document No. 366. OFFICE OF THE CHIEF SIGNAL OFFICER. WAR DEPARTMENT, OFFICE OF THE CHIEF OF STAFF, _Washington, April 20, 1910_. The following Manual of Visual Signaling, prepared in the Office of the Chief Signal Officer, is approved and herewith published for the information and guidance of the Regular Army and the Organized Militia of the United States, and supersedes all other pamphlets or similar instructions heretofore issued upon the subject. Officers and men of the Signal Corps will thoroughly familiarize themselves with the instructions and suggestions contained herein. By order of the Secretary of War. TASKER H. BLISS, _Brig. General, General Staff, Acting Chief of Staff_. TABLE OF CONTENTS. Page. CHAPTER I.--INTRODUCTION 9 CHAPTER II.--_Visual signaling equipment._ The wand 11 The flag kit: The 2-foot flag kit 12 The 4-foot flag kit 12 Care of flag material 13 Powers and limitations of flag signaling 13 The heliograph: Historical 14 Description 14 Assembling 17 Adjustment 20 Operation 21 Care of apparatus 22 Powers and limitations of the heliograph 22 The signal lantern: Acetylene 23 Calcium carbide 23 Method of gas generation 24 Description 25 Operation and care 30 Powers and limitations of the signal lantern 35 Rockets and shells: Description 35 Operation 38 Employment 40 The semaphore: Description 40 The searchlight: Methods of employment 41 The Coston signals 41 Very's night signals 42