The sixth operation (illustrated in Fig. 6) is performed by torsion,
and for this purpose one end of the rod is held fixed while the other
is twisted once or twice in opposite directions, until by fatigue of
the metal at the points, _f_, the whole of the links are severed
almost at the same instant, and a chain of roughly formed stayed links
is produced.
The seventh operation (illustrated in Fig. 7) is to remove the
superfluous projecting pieces of metal both from the inside and
outside of the ends of the links. For this purpose the two ends of
each link are operated on at the same time by two pairs of punches
corresponding to the outline of the ends of the link.
The eighth operation (illustrated in Fig. 8) is to bring the ends of
the links to their finished rounded form. This is performed by
stamping both ends of each link at the same time between pairs of
shaping dies or swages.
The ninth operation (illustrated in Fig. 9) is to bring the middle
portion of each link--that is to say, the side members and the cross
stay--to the finished rounded form, which is also performed by means
of a pair of dies or swages.
The tenth and last operation (illustrated in Fig.
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