Rub disc and bearing bright all over.
Replace the bearing in its hole, slip the disc over it, and push the shaft
through both bearings. Move the disc about until the shaft turns easily,
mark the screw holes, and insert the screws. Finally, solder the bearing to
the disc while the shaft is still in place.
The wheel is a flat brass disc 4 inches in diameter. Polish this, and
scratch on one side twelve equally spaced radii. At the end of each radius
a small cup, made by bending a piece of strip brass 1/4 inch wide and 1/2
inch long into an arc of a circle, is soldered with its extremities on the
scratch. A little "Tinol" soldering lamp (price 1s. 6d.) comes in very
handy here.
To fix the wheel of the shaft requires the use of a third small piece of
tubing, which should be turned off quite square at both ends. Slip this and
the wheel on the shaft, and make a good, firm, soldered joint. Note.--
Consult Fig. 107 for a general idea of the position of the wheel, which
must be kept just clear of the case by the near bearing.
[Illustration: FIG. 107.--Plan of water turbine, showing arrangement of
nozzle.
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