and an inside diameter of 9 in. and
glue to each side two other rings 1/4 in. thick with the same
inside diameter as the first ring and 11 in. outside diameter,
thus forming a 1/4-in. channel in the circumference of the ring.
If a lathe is at hand this ring can be made from a solid piece and
the channel turned out. Cut another circular piece 11 in. in
diameter for a base. Make a hole in the center of this piece 1 in.
wide and 6-5/16 in. long, into which the ring first made should
fit so that its inner surface is just even with the upper surface
of the baseboard. The ring is held upright in the hole by a small
strip screwed to the base as shown. All screws and brads that are
used must be of brass. The cutting of these circular pieces is not
so difficult if a band saw driven by power is used. They can be
cut by means of a key-hole saw if a band saw is not accessible.
Before mounting the ring on the base, the groove should be wound
with 8 turns of No. 16 double cotton-covered magnet wire. The two
ends may be tied together with a string to hold them temporarily.
Fasten two strips of wood 1/4-in.
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