48, 49, 51 and 52, we must attach the regulator
bar to a plate of heavy brass, as shown at Fig. 47, where _A_ represents
the brass plate, and _B_ the regulator bar, arranged for grinding and
polishing flat.
[Illustration: Fig. 51]
[Illustration: Fig. 52]
For attaching the regulator bar _B_ to the brass plate _A_, a good plan
is to cement it fast with lathe wax; but a better plan is to make the
plate _A_ of heavy sheet iron, something about 1/8" thick, and secure
the two together with three or four little catches of soft solder. It is
to be understood the edges of the regulator bar or the regulator spring
are polished, and all that remains to be done is to grind and polish the
flat face.
Two pieces _a a_ of the same thickness as the regulator bar are placed
as shown and attached to _A_ to prevent rocking. After _B_ is securely
attached to _A_, the regulator should be coated with shellac dissolved
in alcohol and well dried. The object of this shellac coating is to keep
the angles formed at the meeting of the face and side clean in the
process of grinding with oilstone dust and oil.
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