The regulator bar _A_ and spring _B_ should be ground
smooth on one side and deeply outlined to perfect form. The regulator
cap _C_ is cut out to the correct size. These parts are of decarbonized
cast steel, annealed until almost as soft as sheet brass. It is not so
much work to finish these parts as one might imagine. Let us take the
regulator bar for an example and carry it through the process of making.
The strip of soft sheet steel on which the regulator bar is outlined is
represented by the dotted outline _b_, Fig. 41.
[Illustration: Fig. 41]
To cut out sheet steel rapidly we take a piece of smooth clock
mainspring about 3/4" and 10" long and double it together, softening the
bending point with the lamp until the piece of mainspring assumes the
form shown at Fig. 42, where _c_ represents the piece of spring and
_H H_ the bench-vise jaws. The piece of soft steel is placed between the
limbs of _c c'_ of the old mainspring up to the line _a_, Fig. 41, and
clamped in the vise jaws.
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