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A TREATISE

ON

ELEMENTARY TRIGONOMETRY.

ON

ELEMENTARY TRIGONOMETRY

BY THE

REV. J. B. LOCK, M.A.

FELLOW OF GONVILLE AND CAIUS COLLEGE, CAMBRIDGE;

FORMERLY MASTER AT ETON.

STEREOTYPED EDITION

London:
MACMILLAN AND CO.
AND NEW YORK.

1892

(The Right of Translation is reserved.]

Printed 1882. New edition 1884, new edition 1885, new edition 1886, new edition 1887, new edition 1888, reprinted 1889, 1890,

1891, March and September 1892.

HARVARD
UNIVERSITY

LIBRARY

FROM THE PREFACE TO THE FIRST

EDITION.

con

The present Work on ELEMENTARY TRIGONOMETRY contains that part of the subject which can veniently be explained without the use of infinite series. It is intended either for class-teaching or for private study. Accordingly the Examples are numerous and for the most part easy. Those which are not original have been selected from the Cambridge and Army Examination Papers of the last

few years.

The Miscellaneous Examples are somewhat more difficult, and should in most cases be postponed until the student reads the subject for the second time.

The order in which the chapters are read may be varied at the discretion of the Teacher.

J. B. L.

ΕΤΟΝ, ,

March, 1882.

In the SECOND EDITION a short course has been indicated for the use of Students who wish to read the Solution of Triangles as early as possible. Such

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