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70-19-19200

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TRE
Treatris

OF

lication be-

Practical Surveying.,

WHICH IS DEMONSTRATED

FROM ITS FIRST PRINCIPLES.

WHEREIN

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 CRUKSHANE,

1808.

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A f 4 5

. 45 1 35

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