I have not attempted to offer a complete enumeration of all
the mechanical principles which regulate the application of
machinery to arts and manufactures, but I have endeavoured to
present to the reader those which struck me as the most
important, either for understanding the actions of machines, or
for enabling the memory to classify and arrange the facts
connected with their employment. Still less have I attempted to
examine all the difficult questions of political economy which
are intimately connected with such enquiries. It was impossible
not to trace or to imagine, among the wide variety of facts
presented to me, some principles which seemed to pervade many
establishments; and having formed such conjectures, the desire to
refute or to verify them, gave an additional interest to the
pursuit. Several of the principles which I have proposed, appear
to me to have been unnoticed before. This was particularly the
case with respect to the explanation I have given of the division
of labour; but further enquiry satisfied me that I had been
anticipated by M. Gioja, and it is probable that additional
research would enable me to trace most of the other principles,
which I had thought original, to previous writers, to whose merit
I may perhaps be unjust, from my want of acquaintance with the
historical branch of the subject.

The truth however of the principles I have stated, is of much
more importance than their origin; and the utility of an enquiry
into them, and of establishing others more correct, if these
should be erroneous, can scarcely admit of a doubt.

The difficulty of understanding the processes of manufactures
has unfortunately been greatly overrated. To examine them with