To get the hole in the casing
correctly situated and sloped, begin by boring a hole straight through, 1/4
inch away laterally from where the steam discharge hole will be, centre to
centre, and then work the walls of the hole to the proper angle with a
circular file of the same diameter as the nozzle piece, which is then
sweated in with solder. It is, of course, an easy matter to fix the nozzle
at the proper angle to a thin plate, which can be screwed on to the outside
of the casing, and this method has the advantage of giving easy detachment
for alteration or replacement.
Balancing the Wheel.--As the wheel will revolve at very high speed, it
should be balanced as accurately as possible. A simple method of testing is
to rest the ends of the spindle on two carefully levelled straight edges.
If the wheel persists in rolling till it takes up a certain position,
lighten the lower part of the wheel by scraping off solder, or by cutting
away bits of the vanes below the circumference of the disc, or by drilling
holes in the disc itself.
Securing the Wheel.--When the wheel has been finally adjusted relatively
to the nozzle, tighten up all the spindle nuts hard, and drill a hole for a
pin through them and the disc parallel to the spindle, and another through
N3 and the spindle.
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