True up the long edges of the blades with a file, and bring them off to a
sharp edge, removing the metal from the convex side.
Fixing the Blades.--Select a piece of wood as thick as half the width of
a finished blade, less half the thickness of the wheel disc. Cut out a
circle of this wood 2 inches in diameter, and bore a hole at the centre.
The wheel disc is then screwed to a perfectly flat board or plate, the
wooden disc being used as a spacer between them.
Slip a blade into place on the disc, easing the central slit, if necessary,
to allow the near edge to lie in contact with the board--that is parallel
to the disc. Solder on the blade, using the minimum of solder needed to
make a good joint. When all the blades are fixed, you will have a wheel
with the blades quite true on one side. It is, therefore, important to
consider, before commencing work, in which direction the concave side of
the blades should be, so that when the wheel is mounted it shall face the
nozzle.
To make this point clear: the direction of the nozzle having been decided,
the buckets on the trued side must in turn present their concave sides to
the nozzle.
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