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10-19-19219

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TRE.
Treatric

OF

lication be-

Practical Surveyițg,"

WHICH IS DEMONSTRATED

FROM ITS FIRST PRINCIPLES.

WHEREIN

Every Thing that is Useful and Curious in that Art,

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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 SURVEYOR$.

PHILADELPHIA:

RINTED BY JOSEPH CRUKSHAN,

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

1808,

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