, and to compare the same with that of other nations. It also
exhibits the extent to which American invention and discovery have
contributed to the world's progress during the last quarter century.
Its production is deemed timely in view of the existing popular
interest in the labors of the mechanic and inventor which has been
awakened by the great International Expositions of the last decade,
and by the wonderful discoveries made by American inventors during the
past three years.

The CONTRIBUTORS whose names are given above number many of the most
eminent American mechanical experts and engineers. Several of their
contributions contain the results of original research and thought,
never before published. Their efforts have in all cases tended to
simplify the subjects treated, to avoid technicalities, and so to
render all that is presented easily understood by the general reader
as well as by the mechanical student. Examples are appended to all
rules, explanations to all tables, and in such matters as the uses of
tools and management of machines the instructions are unusually minute
and accurate.

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