If only a
few pairs of cotton stockings should be required, it would be an
absurd waste of time, and of capital, to construct a
stocking-frame to weave them, when, for a few pence, four steel
wires can be procured by which they may be knit. If, on the other
hand, many thousand pairs were wanted, the time employed, and the
expense incurred in constructing a stocking-frame, would be more
than repaid by the saving of time in making that large number of
stockings. The same principle is applicable to the copying of
letters: if three or four copies only are required, the pen and
the human hand furnish the cheapest means of obtaining them; if
hundreds are called for, lithography may be brought to our
assistance; but if hundreds of thousands are wanted, the
machinery of a printing establishment supplies the most
economical method of accomplishing the object.
330. There are, however, many cases in which machines or
tools must be made, in which economical production is not the
most important object. Whenever it is required to produce a few
articles parts of machinery, for instance, which must be executed
with the most rigid accuracy or be perfectly alike--it is nearly
impossible to fulfil this condition, even with the aid of the
most skilful hands: and it becomes necessary to make tools
expressly for the purpose, although those tools should, as
frequently happens, cost more in constructing than the things
they are destined to make.
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