Watch officer, 167 duty, 167 in port, 183 not citizens, +147+ Watch-relieving, +170+ rest before going on, +169+ Watches, three, +168+ Wedges, 76 Weights and measures, +13+ of persons, +107+ Whistle signals, 81 White, 304 Windlass notes, 73 Wooden steamers, 86 warehouse, 74 Working boat, 74 cargo, 81 Work of Chief mate, 76 Wrecking, +298+ Z Zig-zag, +180+ _BY THE SAME AUTHOR_ UNDER SAIL A narrative of the old square-rigger sailing ship days, detailing the story of a voyage around Cape Horn to Honolulu and back to New York in the American three skysail yarder A. J. Fuller in 1897-8. _IN PRESS_ THE LITERATURE _of_ NAVAL AND MARINE SCIENCE On our shelves is the most complete stock of technical, industrial, engineering and scientific books in the United States. The technical literature of every branch of naval architecture, construction, ordnance, marine engineering, seamanship and navigation is well represented, as well as are the various other related subjects. A large number of these we publish and for an ever increasing number we are the sole agents. [Illustration: Publisher's Mark] _All Our Inquiries are Cheerfully and Carefully Answered and Complete Catalogs as well as Special Lists are Sent Free on Request_ D. VAN NOSTRAND COMPANY _Publishers and Booksellers_ 25 PARK PLACE NEW YORK VAN NOSTRAND'S NAUTICAL MANUALS 175 Pages 5 × 7½ Postpaid, $2.00 The Whys and Wherefores of Navigation By GERSHOM BRADFORD, 2d. Navigating Officer and Senior Instructor New York State Nautical Schoolship Newport Late Nautical Expert Hydrographic Office, U.S.N. CONTENTS: Nautical Astronomy. Declination. Right Ascension. Precession of the Equinoxes. Time. Sidereal Time. Equation of Time. Calendar. Corrections for Observed Altitude. Index Correction. Semi-diameter. Refraction. Dip. Parallax. Circum or Ex-Meridian Altitude. Polaris. Observations for the Correction of the Compass. Longitude. Sumner Method. The New Navigation. The Moon. Charts. _An American book of intimate and interesting information on the subject of Navigation. If you want to know "why," own and study Bradford. It is a book for the man who likes to understand his subject thoroughly—simple, clear, complete._ VAN NOSTRAND'S MILITARY BOOKS 231 Pages 51 Plates—Many in Colors Pocket Size Price $1.00 MILITARY and NAVAL RECOGNITION BOOK _A handbook on the organization, insignia of rank, and customs of the service of the World's Important Armies and Navies._ BY Lieut. J. W. BUNKLEY U. S. Navy A complete, correct and fully illustrated guide to the insignia of our army and navy as well as of those of the nations engaged in the war, compiled from official sources and useful alike to civilians as well as to the Army and Navy. You will need this book to help you recognize our boys at home and to distinguish the other boys "over there."