]
[Illustration: Fig. 285. A Clamp.]
The Wind Wheel.
Our next task was to construct the wind wheel. First we procured three
boards, each 3 inches wide and 3-1/2 feet long. A 1/2-inch hole was
drilled in the center of each board, and then, with these holes
coinciding, the boards were nailed together, with their ends projecting,
like spokes, equally distant from each other. Six wedges were now made of
the size indicated in Fig. 286. These were made of a 2 x 4-inch scantling,
sawed diagonally in two and then planed down to the given dimensions. The
wedges were now nailed firmly to the spokes, as shown in Fig. 286. For the
blades we used six thin boards, each about 4 feet long. Each blade
measured 10 inches in width at the outer end, and tapered down to a width
of 3 inches at the inner end, as illustrated in Fig. 288. The blades were
now securely nailed to the wedges, and their outer ends were braced
together by means of wires stretched from the forward edge of each blade
to the rear edge of the next one ahead. The wheel was then fitted onto the
shaft and nailed to one of the clamps. In this way it was practically
keyed to the shaft.
[Illustration: Fig. 286. Wedge for Wind Wheel.]
[Illustration: Fig.
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