steel is brought by the workman under the die which at each blow cuts out a flat piece of the metal, having the form intended for the pen. Two other workmen are employed in placing these flat pieces under two other presses, in which a steel chisel cuts the slit. Three other workmen occupy other presses, in which the pieces so prepared receive their semi-cylindrical form. The longer time required for adjusting the small pieces in the two latter operations renders them less rapid in execution than the first; so that two workmen are fully occupied in slitting, and three in bending the flat pieces, which one man can punch out of the sheet of steel. If, therefore, it were necessary to enlarge this factory, it is clear that twelve or eighteen presses would be worked with more economy than any number not a multiple of six.
The same reasoning extends to every manufacture which is conducted upon the principle of the Division of Labour, and we arrive at this general conclusion:—When the number of processes into which it is most advantageous to divide it, and the number of individuals to be employed in it, are ascertained, then all factories which do not employ a direct multiple of this latter number, will produce the article at a greater cost. This principle ought always to be kept in view in great establishments, although it is quite impossible, even with the best division of the labour, to attend to it rigidly in practice. The proportionate number of the persons who possess the greatest skill, is of course to be first attended to. That exact ratio which is most profitable for a factory employing a hundred workmen, may not be quite the best where there are five hundred
