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PRINCIPLES, THEOREMS, RULES, AND TABLES,

IN VARIOUS DEPARTMENTS

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TO THE PURSUITS OF SURVEYORS, ARCHITECTS, MECHANICS,

AND CIVIL ENGINEERS.

WITH

NUMEROUS ENGRAVINGS.

BY

OLINTHUS GREGORY, LL.D., F.R.A.S.,

Corresponding Associate of the Academy of Dijou; Honorary Member of the Literary and Philosophical Society of
Ne York; of the New York Historical Society; of the Literary and Philosophical, and the Antiquarian
Secieties of Newcastle-upon-Tyne ; of the Cambridge Philosophical Society; of the Institution

of Civil Engineers, &c. &c., and Professor of Mathematics in the Royal Military Academy.

SECOND AMERICAN FROM THE SECOND LONDON EDIȚION,

CORRECTED AND IMPROVED.

Only let men awake, and fix their eyes, one while on the nature of things, another while

on the application of them to the use and service of mankind."-Lord Bacon.

PHILADELPHIA:
HENRY CAREY BAIRD,

INDUSTRIAL PUBLISHER,
No. 40 6 WALNUT STREET.

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