Fig. 2413.
Fig. 2414.
To prevent surfaces or forms of this class from altering their shape or dimensions during the hardening process, slips of iron are sometimes fitted to them before they are placed in the hardening box. Thus [Fig. 2414] represents a double eye, and [Fig. 2413] a link having thin pieces fitted in as shown at a in both figures.
The heating for the hardening process is also apt to impair the alignment of the work, causing it to require resetting by the aid of parallel strips and straight-edges.
