10) is to contract
the link slightly in the lateral direction in order to correct any
imperfections at the sides left by the two previous operations and
bring the link to a more perfect and stronger form, as shown. This
operation has the important result of strengthening the link
considerably by contracting or rendering more pointed the arched form
of the bow or end of the link, and also by thickening the metal at
that part where the wear is greatest, this thickening of the metal at
the ends of the link occurring in the direction of the line of strain
(as indicated by _x_ in Fig. 10) and being brought about by the
compression or "upsetting" of the metal at the end of the link. It may
be preferable to perform this operation immediately after the seventh
operation, and I reserve the right to do so.
In the case of large cables only the metal is preferably heated for
the eighth, ninth, and tenth operations.
I will now refer to the figures which illustrate the series of tools
whereby the above mentioned operations are performed.
Fig. 1_a_ shows a plan (the punch being in section) and Fig. 1_b_ an
elevation of the bed die of the tool by which the notches _b_ of the
first operation are performed.
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