Blacken the piston rod in a candle flame to prevent
solder adhering.
Steam Chest.--The walls of the steam chest are best made in one piece out
of 1/2-inch brass by cutting out to the dimension given in Fig. 58. A sharp
fret saw will remove the inside rectangle. Get both inside and outside
surfaces as square as possible in all directions, and rub down the two
contact faces on emery cloth supported by an old looking-glass.
[Illustration: FIG. 68.-Wall-piece for steam chest, with gland and valve
rod in position.]
Two perfectly flat plates of 1/8-inch brass are cut to the size given in
Fig. 59, or a little longer both ways, to allow for working down to the
same area as the wall-piece. This operation should be carried out after
soldering the three pieces together. File and rub the sides until no
projections are visible. Then drill twelve 3/32-inch holes right through
the three parts. After separating them, the holes in the walls and what
will be the cover must be enlarged to an easy fit for 1/8-inch bolts, and
the valve plate tapped.
Now drill 3/16-inch holes centrally through the ends of the walls for the
valve rod.
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