FOR

PRACTICAL MEN:

BEING

A COMMON PLACE BOOK

OF

PURE AND MIXED MATHEMATICS,

DESIGNED CHIEFLY FOR THE USE OF

CIVIL ENGINEERS, ARCHITECTS, AND SURVEYORS.

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

THIRD EDITION, REVISED AND ENLARGED

BY HENRY LAW,

CIVIL ENGINEER.

LONDON:

JOHN WEALE, 59, HIGH HOLBORN.

ΤΟ

SIR ISAMBART BRUNEL, F.R.S.,

ETC. ETC. ETC.

THIS WORK,

DESIGNED FOR THE USE OF MEMBERS OF THAT PROFESSION WHICH