109. In flattening such pieces to prevent turning, we
should cut away about two-fifths, as shown at Fig. 119, which is an end
view of Fig. 118 seen in the direction of the arrow _c_. In such
flattening we should not only cut away two-fifths at one end, but we
must preserve this proportion from end to end. To aid in this operation
we make a fixed gage of sheet metal, shaped as shown at _I_, Fig. 120.
[Illustration: Fig. 119]
ESCAPEMENT MATCHING DEVICE DESCRIBED.
[Illustration: Fig. 120]
In practical construction we first file away about two-fifths of _F_ and
then grind the flat side on a glass slab to a flat, even surface and, of
course, equal thickness from end to end. We reproduce the sleeve _G_ as
shown at Fig. 113 as if seen from the left and in the direction of the
axis of the bar _F_. To prevent the bar _F_ turning on its axis, we
insert in the sleeve _G_ a piece of wire of the same size as _F_ but
with three-fifths cut away, as shown at _y_, Fig. 121. This piece _y_ is
soldered in the sleeve _G_ so its flat face stands vertical.
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