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PLANE AND SPHERICAL
G. A. WENTWORTH, A.M.,
FROFE8SOR OP MATHEMATICS IN PHILLIPS EXETER ACADEMY.
Entered, according to Act of Congress, in the year 1883, by
G. A. WENTWORTII, in the Office of the Librarian of Congress, at Washington.
N preparing this work the aim has been to furnish just so much
-L of Trigonometry as is actually taught in our best schools and colleges. Consequently, development of functions in series and all other investigations that are important only for the special studeut have been omitted. 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 and Navigation is to present these subjects in a clear and intelligible way, according to the best methods in actual use; and also to present them in so small a compass that students in general may find the time to acquire a competent knowledge of these very interesting and important studies.
The author is under particular obligation for assistance to Q. A. Hill, A M., of Cambridge, Mass., and to Prof. James L. Patterson, of Lawrenceville, N.J.
G. A. WENTWORTH.
Phillips Exeter Academt,