his "job" to definite size, and to the forms given by drawings, which
drawings should be made by the apprentice himself. When he is able to
do good work of this kind, he should attempt larger work, and the
construction of parts of structures involving exact fitting and special
manipulations. The course, finally, should conclude with exercises in
the construction and erection of complete structures and in the making
of peculiar details, such as are regarded by the average workman
as remarkable "_tours de force_." The trade school usually gives
instruction in the common school branches of education, and especially
in drawing, free-hand and mechanical, carrying them as far as the
successful prosecution of the trade requires. The higher mathematics,
and advanced courses in physics and chemistry, always taught in schools
of engineering, are not taught in the trade school, as a rule; although
introduced into those larger schools of this class in which the aim is
to train managers and proprietors, as well as workmen. This is done in
many European schools.

As is seen above, the course of instruction in mechanical engineering
includes some trade education. The engineer is dependent upon the
machinist, the founder, the patternmaker, and other workers at the
trades, for the proper construction of the machinery and structures
designed by him. He is himself, in so far as he is an engineer, a
designer of constructions, not a constructor. He often combines,
however, the functions of the engineer, the builder, the manufacturer,
and the dealer, in his own person. No man can carry on, successfully,
any business in which he is not at home in every detail, and in which he
cannot instruct every subordinate, and cannot show every person employed
by him precisely what is wanted, and how the desired result can be best
attained. The engineer must, therefore, learn, as soon and as thoroughly
as possible, enough of the details of every art and trade, subsidiary