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TRE

Every Thing that is Useful and Curious in that Art,

IS FULLY CONSIDERED AND EXPLAINED, PARTICULARLY

THREE NEW AND VERY CONCISE METHODS FOR
DETERMINING THE AREAS OF RIGHT-LINED
FIGURES, ARITHMETICALLY OR BY CALCU
LATION, AS WELL AS THE
GEOMETRICAL
ONES HERETOFORE TREATED OF.

The whole illustrated with Copper-plates.

THE NINTH EDITION.

BY ROBERT GIBSON, TEACHER OF THE MATHEMATICS.

WITH ALTERATIONS AND AMENDMENTS,
ADAPTED TO THE USE OF AMERICAN SURVEYORS.

PHILADELPHIA:

PRINTED BY JOSEPH CRUKSHANK

...............

1808,

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