We therefore offer to our readers a design for a small turbine of
a superior character. This turbine is shown in elevation and section in
Fig. 70. The casing is, as in the preceding instance, made up of flat brass
plates and a ring of tubing, and the bearings, BG1, BG2, of brass tube. But
the wheel is built up of a disc 3 inches in diameter, round the
circumference of which are 32 equally-spaced buckets, blades, or vanes,
projecting 5/8 inch beyond the edge of the disc. The wheel as a whole is
mounted on a spindle 3-1/8 inches long, to which it is secured by three
nuts, N1 N2 N3. One end of the spindle is fined down to take a small
pinion, P1, meshing with a large pinion, P2, the latter running in
bearings, BG3, in the wheel-case and cover. The drive of the turbine is
transmitted either direct from the axle of P2 or from a pulley mounted on
it.
CONSTRUCTION.
[Illustration: FIG. 71.--Plate marked out for turbine wheel blades. B is
blade as it appears before being curved.]
The Wheel.--If you do not possess a lathe, the preparation of the spindle
and mounting the wheel disc on it should be entrusted to a mechanic.
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