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Ernest Gallaudet Draper
Lectures in Navigation

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[Transcriber's Note:-


Words and phrases surrounded by underscores are italicised.


There are four symbols which are denoted by :-


(.) Circle surrounding a centred dot-Right Ascension of the


Meridian;


(+) Circle surrounding a cross-Earth's Central Progress;


() Circle with centre dot and line under-Observed altitude of sun's


lower limb;


-(-)- Circle with line through-True Altitude.


]


LECTURES IN NAVIGATION


Prepared for Use as a Text Book


at the


OFFICERS' MATERIAL SCHOOL NAVAL AUXILIARY RESERVE


by


Lieutenant ERNEST G. DRAPER, U.S.N.R.F.


Head of the Department of Navigation


Officers' Material School, Naval Auxiliary Reserve


COPYRIGHT BY ERNEST G. DRAPER



<p>FOREWORD.</p><br />


These Lectures have been compiled as speedily as possible to meet the demand for some quick but fairly comprehensive method whereby large bodies of men, divided into small classes, might learn the elements of Navigation and thus assume, without delay, their responsibilities as Junior Officers of the deck, Navigators and Assistant Navigators in the United States Naval Auxiliary Reserve.


I realize that the haste with which the book has been written is apparent in many places, and it is hoped that many evidences of this haste will disappear in case further editions are printed. Besides acknowledging the help and information which was secured from the list of navigational works, mentioned on another page, I wish to mention particularly Prof. Charles Lane Poor's book, entitled "Nautical Science," from which was secured practically all of the information in the Lecture on Planets and Stars (Tuesday-Week V); Commander W. C. P. Muir's book, "Navigation and Compass Deviations," and Lieutenant W. J. Henderson's book, "Elements of Navigation," the text of which was followed closely in discussing Variation and Deviation and Traverse Sailing.


I desire to express my gratitude to Lieutenant Commander R. T. Merrill, 2nd, U. S. N., for suggesting a detailed outline of the whole course; to Lieutenant Commander B. O. Wills, U. S. N., for his valuable criticisms and almost daily help during the preparation of these Lectures; to Lieutenant (j. g.) C. D. Draper, U. S. N. R. F.; Lieutenant (j. g.) R. Brush, U. S. N. R. F., and Lieutenant (j. g.) P. C. McPherson, U. S. N. R. F., for many criticisms and suggestions; and to Captain Huntington, Seamen's Church Institute, for suggesting helpful diagrams, particularly the one on page 44. This opportunity is also taken for thanking the many Instructors in the School for their opinions on various questions that have come up in connection with the course and for assistance in eliminating errors from the text.


E. G. D.



LIST OF BOOKS CONSULTED


AMERICAN PRACTICAL NAVIGATOR, BOWDITCH


NAVIGATION AND COMPASS DEVIATIONS, MUIR


NAUTICAL SCIENCE, POOR


ELEMENTS OF NAVIGATION, HENDERSON


WRINKLES IN PRACTICAL NAVIGATION, LECKY


WHYS AND WHEREFORES OF NAVIGATION, BRADFORD


EPITOME OF NAVIGATION, NORIE


NAVIGATION, HOSMER


FINDING A SHIP'S POSITION AT SEA, SUMNER


GENERAL ASTRONOMY, YOUNG



<p>PREFACE.</p><br />


TO THOSE TAKING THIS COURSE IN NAVIGATION:


These lectures have been written with the idea of explaining, in as simple language as possible, the fundamental elements of Navigation as set forth in Bowditch's American Practical Navigator. They will be given you during the time at the Training School devoted to this subject. At present this time includes two morning periods of one and a half hours each, separated by a recess of fifteen minutes. In general the plan is to devote the first period to the lecture and the second period to practical work.


Not many examples for practical work have been included in this book, but one example, illustrating each new method, has been worked out. If you understand these examples you should be able to understand others similar to them.


Toward the end of the course a portion of each second period will be devoted to handling the sextant, work with charts, taking sights, etc. In short, every effort will be made to duplicate, as nearly as possible, navigating conditions on board a modern merchant ship.


DEPARTMENT OF NAVIGATION,


Officers' Material School,


Naval Auxiliary Reserve


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