Mark out and drill the tube holes in the bottom, and then the flue hole,
for which a series of small holes must be made close together inside the
circumference and united with a fret saw. Work the hole out carefully till
the flue, which should be slightly tapered at the end, can be driven
through an eighth of an inch or so. The flue hole in the top should be made
a good fit, full size.
Rivet a collar, x (Fig. 80, a), of strip brass 1/4 inch above the bottom of
the flue to form a shoulder. Another collar, y (Fig. 80, c), is needed for
the flue above the top plate. Put the ends and flue temporarily in place,
mark off the position of y, and drill half a dozen 5/32-inch screw holes
through y and the flue. Also drill screw holes to hold the collar to the
boiler top.
The steam-pipe is a circle of 5/16-inch copper tube, having one end
closed, and a number of small holes bored in the upper side to collect the
steam from many points at once. The other end is carried through the side
of the boiler.
[Illustration: FIG. 81.--Perspective view of horizontal boiler mounted on
wooden base.
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