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THEORETICAL AND PRACTICAL TREATISE

ON THE

STRAINS, DESIGNING, AND ERECTION OF

WORKS OF CONSTRUCTION

BY FRANCIS CAMPIN, C.E.

PAST PRESIDENT OF THE CIVIL AND MECHANICAL ENGINEERS' SOCIETY ; AUTHOR OF
IRON BRIDGES, GIRDERS, ROOFS, ETC.; "MECHANICAL ENGINEERING,'

ETC., ETC., ETO.

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LONDON
CROSBY LOCKWOOD AND C.O.
7, STATIONERS' HALL COURT, LUDGATE HILL

1881

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vi

There are comparatively few of those entering upon a mechanical profession who are thoroughly accomplished mathematicians, and once launched upon the business of life—or what is equivalent to it, the probationary term which precedes actual remunerative employment—the tyro will not desire to give time to the study of abstruse science, beyond the point where it ceases to be absolutely necessary for his purposes ; and there are many who have only learned these exact sciences bit by bit as they have found them

necessary. Another matter of common consideration is, that even in those who have become proficient at school and college in pure mathematics, this knowledge, unless sedulously maintained and reinforced by after-study, rapidly decays, and is often only with great difficulty revived; and the time absorbed by this reinforcement or revival is generally required for the purposes of more directly practical study.

Although all structures should combine in themselves both strength and stability, I have, for the sake of clearness, separated the two classes as far as can conveniently be done for theoretical investigation; showing, however, their necessary connection in suitable places.

In the examples taken to illustrate the methods calculation, I have carefully selected cases such as in every-day practice, and carried them through to leave no doubt or difficulty as to the pro tion of the formula.

In conclusion, I would add t) in any way as an elem science of construct the sul

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