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"TAE MARINE. REVIEW 9 THE ELEMENTS OF NAVIGATION A short and complete explanation of the stan- dard methods of finding the position of a ship at sea and the course to be steered Designed for the instruction of beginners W. J. HENDERSON, Illustrated. The need of a short, simple, and yet comprehensive book on the art of navigating a ship has led the author to undertake the preparation of the present work. The aim of the book is to instruct the beginner, lead- ing him step by step from the first operations to the perfection of the art as found in the Sumner method. The instructions have been made as terse as possible, and yet the author believes that clearness has not been sacrificed. Fundamental principles have been ex- plained, but no attempt has been made to elucidate the higher mathematics on the subject, Students who have tried to learn navigation from books like Captain Lecky's inimitable '"Wrinkles in Practical Naviga- tion", which is addressed to navigators only, or from Bowditch's "American Navigator', which is only for mathematicians, will, it is hoped, appreciate this little book. The explanations of the uses of the tables and the "Nautical Almanac'"' are a new feature ina work of this kind. CONTENTS S, Automatic Injector a 100% Efficiency Read this condensed report by R. M. Thurs- ton, Prof. Engineer- ing, Cornell University and then you will know why the U. S. Automatic Injector is endorsed by the U.S. Government and by over 200,000 engineers. "In regard to the economy of the U.S. Injector, that instrument shows an effi- ciency of 100 per cent. and is ideally per- fect because no steam is wasted and all the heat not employed in the. thermo- dynamic operation of forcing water into the boiler is saved by being returned to the boiler from which it is issued. There is absolutely no waste. .°. . ." (Signed) R. M. Thurston, Professor Engineering, Cornell University. Engineers' Red Book Free. Send for a copy of this brief compendium of valuable information for engineers. Also contains detailed description ofj{the U. S. Automatic Injector. =. Qs Tuas: American Injector Co., DETROIT, U. S. A. Introduction Variation Deviation How to find the Deviation Leeway The Log The Lead-Line Charts Chart Sailing Dead-Reckoning Examples for Practice Working a Traverse Hove to Shaping the Course Navigation by Observation Sextant Adjustments _ Index Error - Hints on Taking Altitudes Correcting the Altitude The Chronometer The Nautical Almanac Apparent and Mean Time--The Equation Compass Error by Azimuths Longitude by Chronometer (or Time) Sight . Remarks on Longitude Longitude by Sunrise and Sunset Sights Chronometer Sight of a Star Sumner's Method Example of Sumner's Method with the Sun Example of Sumner Lines with Two Stars Great-Circle Sailing Distance and Danger Angles Allowance for Tides Keeping the Log Rating a Chronometer Care of a Chronometer Hints on Conducting Voyages Examples for Practice: Dead-Reckoning Shaping Course by Mercator's Sailing j i | Fl f fr ; Al fl ; ] i a! | il}, at cay | ! PUSAN i f ' "ff | j 'i Ug GN 1 vif | ESS Se eG Pr. \ in i) ; \ arta ! ht i! l jm, Et ' pth PENBERTHY Injectors and Engine Room Specialties j " i Latitude by Meridian Altitude Latitude by Meridian Altitude : a < f Sun Latitude by Meridian Altitude of © esr oe ee Latitude by Meridian Altitude Latitude by Meridian Altitude of of Star a Planet Latitude by Meridian Altitude Latitude by Meridian Altitude of Below the Pole the Moon Latitude by Ex-Meridian Alti- Meridian Altitude below the Pole tudes Latitude by Ex-Meridian Altitude Latitude by the Polestar of the Sun Longitude by Chronometer Latitude by the Polestar Sight are upheld by over 450,000 engineers as the standard aut; tio inj the orld utomatio injector of ERTHY water gages, é cocks, oil and grease cups, injectors, I oil pumps. etc., maintain the high I standard of excellence which the ] U 7 fh | name. of PENBERTHY stands for. The Penberthy Engineer & Fire- man, a 32-page monthly magazine for engineers, sent 3 months free on request. Write for our catalog for engineers. =. eo ntli--tt es e hh PENBERTHY INJECTOR = CO: Largest manufacturers of injectors in the world. 351 Holden Ave., Detroit, Mich. MADE IN OANADA BY The Penberthy Injector Co., Ltd., indgor, Ont. PRICE $1.00 The Marine Review Cleveland