A brass elbow, which may be purchased for a few pence, should be driven
into the waste hole, and a small shield be nailed under the air hole. A
couple of screwed-on cross pieces are required to steady the motor sideways
and raise the elbow clear of the ground.
The motor may be geared direct to a very small dynamo, if the latter is
designed to run at high speeds. If a geared-down drive is needed, a small
pulley--such as is used for blinds, and may be bought for a penny--should
be attached to the shaft, and a bootlace be employed as belt. Avoid
overloading the wheel, for if it is unable to run at a high speed it will
prove inefficient.
[Illustration: FIG. l08.-Water motor working a photographic dish-rocker.]
Lubrication.--The water will keep the bearings cool, but the bearings
should be well lubricated. The most convenient method of effecting this is
to bore holes in the bearings, and from them run small pipes to an oil
reservoir on the top of the case (as in Fig. 70), where they are fed on the
siphon principle through strands of worsted.
Alternative Construction.--If an all-metal case is preferred, the reader
might utilize the description given of a steam turbine on pp.
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