This pipe
should be connected with a closed chamber or with the exhaust at a point
lower than the base of the turbine case.
Stirrup.--Fig. 69 shows a stirrup carrying a screw which presses against
the pulley end of the spindle. This attachment makes it easy to adjust the
distance between the rotor and the steam ports, and also concentrates all
end thrust on to a point, thereby minimizing friction. The stirrup can be
fashioned in a few minutes out of brass strip. Drill the holes for the
holding-on screws; drill and tap a hole for the adjusting screw; insert the
screw and centre it correctly on the spindle point. Then mark the
position of the two screw holes in E; drill and tap them.
Feet are made of sheet brass, drilled to take the three (or two) lowermost
bolts, and bent to shape. Note.--A side and foot may be cut out of one
piece of metal. The difficulty is that the bending may distort the side,
and prevent a tight joint between side and ring.
Assembling.--Cut out two rings of stout brown paper a quarter of an inch
wide and slightly larger in diameter than the casing ring.
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