If the weight of the material is considerable,
this reason acts with additional force; but even where it is
light, the danger arising from frequent removal may render it
desirable to have all the processes carried on in the same
building. In the cutting and polishing of glass this is the case;
whilst in the art of needle-making several of the processes are
carried on in the cottages of the workmen. It is, however, clear
that the latter plan, which is attended with some advantages to
the family of the workmen, can be adopted only where there exists
a sure and quick method of knowing that the work has been well
done, and that the whole of the materials given out have been
really employed.
265. The inducement to contrive machines for any process of
manufacture increases with the demand for the article; and the
introduction of machinery, on the other hand, tends to increase
the quantity produced and to lead to the establishment of large
factories. An illustration of these principles may be found in
the history of the manufacture of patent net.
The first machines for weaving this article were very
expensive, costing from a thousand to twelve or thirteen hundred
pounds.
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