AN

ELEMENTARY TREATISE.

ON

PLANE AND SPHERICAL TRIGONOMETRY,

WITH THEIR APPLICATIONS TO

NAVIGATION, SURVEYING, HEIGHTS AND DISTANCES,
AND SPHERICAL ASTRONOMY,

AND PARTICULARLY ADAPTED TO EXPLAINING

THE CONSTRUCTION OF BOWDITCH'S NAVIGATOR AND THE
NAUTICAL ALMANAC.

BY

BENJAMIN PEIRCE, LL.D.,

Perkins Professor of Astronomy and Mathematics in Harvard University;
and Consulting Astronomer to the American Ephemeris and Nautical Almanac.

REVISED EDITION.

BOSTON AND CAMBRIDGE:

JAMES MUNROE AND COMPANY.

M DCCC LXI.