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TRIGONOMETRY, SURVEYING

AND TABLES

BY

G. A. WENTWORTH, A.M.

AUTHOR OF A SERIES OF TEXT-BOOKS IN MATHEMATICS

REVISED EDITION

BOSTON, U.S.A., AND LONDON

GINN & COMPANY, PUBLISHERS

1895

HARVARD COLLEGE LIBRARY

GIFT OF

MISS ELLEN L. WENTWORTH

MAY 8 1939

Entered, according to Act of Congress, in the year 1882, by

G. A. WENTWORTH

in the Office of the Librarian of Congress, at Washington.

Copyright, 1895, by G. A. WENTWORTH.

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IN

N preparing this work the aim has been to furnish just so much of Trigonometry as is actually taught in our best schools and colleges. Consequently, all investigations that are important only for the special student have been omitted, except the development of functions in series. The principles have been unfolded with the utmost brevity consistent with simplicity and clearness, and interesting problems have been selected with a view to awaken a real love for the study. Much time and labor have been spent in devising the simplest proofs for the propositions, and in exhibiting the best methods of arranging the logarithmic work.

The object of the work on Surveying is to present this subject in a clear and intelligible way, according to the best methods in actual use; and also to present it in so small a compass that students in general may find the time to acquire a competent knowledge of this very interesting and important study.

The author is under particular obligation for assistance to G. A. Hill, A.M., of Cambridge, Mass., to Prof. James L. Patterson, of Schenectady, N.Y., to Dr. F. N. Cole, of Ann Arbor, Mich., and to Prof. S. F. Norris, of Baltimore, Md.

G. A. WENTWORTH.

EXETER, N.H., July, 1895

PLANE TRIGONOMETRY.

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