Then from a board 1 inch thick four 9-inch disks were sawed out. We cut
these disks in the same way as we had made the disks for our surveying
rod (see page 78), by making cuts across corners and finally smoothing
off the angles with a draw-knife. A half-inch hole was now drilled in the
center of each disk. Then on each large disk a smaller one was placed,
with the center holes of the two coinciding and the grain of one lying
across the grain of the other. In this position they were firmly nailed
together, making a wheel like those used on a railway car, with the small
disc forming the tread of the wheel and the large disk serving as a flange.
[Illustration: Fig. 298. The Car Wheel.]
The Car Axles.
For the car axles we bought four 1/2-inch bolts, 6 inches long, with two
washers and two nuts for each bolt. In each side of the car, about 8
inches from the ends, we nailed face blocks; that is, blocks of wood for
the wheels to bear against. These face blocks were only 1/2 inch thick.
Then in these blocks holes were drilled which were carried clear through
the scantling. The holes were just large enough for the bolts to fit
snugly in them. The bolts were inserted from the inside, so that their
threaded ends projected out at each side of the car.
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