Make the lug 1/4 in. deep, and the projections B, b, 1/2 in. deep.
The entire cut should be slightly beveled.
Now take another piece of wood, and cut out a wheel, as shown in
Fig. 2. This also should be slightly beveled. When it is finished,
place it on one of the square pieces of wood, with the largest
side down, then place the square piece out of which Fig. 1 was
cut, around the wheel, with the open side down. (We shall call
that side of a mold out of which a casting is drawn, the "open"
side.) Place it so that it is even at the edge with the under
square piece and place the wheel so that the space between the
wheel and
[Illustration: Fig. 1]
the other piece of wood is an even 1/8 in. all the way around.
Then nail the wheel down firmly, and tack the other piece
slightly.
Procure a thin board 1/4 in. thick, and cut it out as shown in
Fig. 3; then nail it, with pins or small nails, on the center of
one of the square pieces of wood. Fit this to the two pieces just
finished, with the thin wheel down--but first boring a 3/4-in.
hole 1/4 in. deep, in the center of it; and boring a 3/8-in.
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