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There are comparatively few of those entering upon a mechanical profession who are thoroughly accomplished mathematicians, and once launched upon the business of lifeor 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 cạn conveniently be done for theoretical investigation; showing, however, their necessary connection in suitable places.

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

In conclusion, I would add that this work is not intended in any way as an elementary introduction only to the science of construction, but deals fully and finally with all the subjects included in its syllabus.

FRANCIS CAMPIN.

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 main-
tained 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 clear-
ness, 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 formule.

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

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