d be filed to a point at
each end so as to move freely in the bearings, B, which are pieces
of hard wood. The spring, H, is fastened at each end by pins, bent
as shown, and should not be too strong or the magnet will be
unable to move the armature.

[Illustration: SOUNDER-A. brass: B. wood: C. soft iron; DD. coils
wound with No. 26 wire: E. nail soldered on A; FF. binding posts:
H spring]

The stop, K, is a wire nail driven deep enough in the base to
leave about 1/8 in. between the armature and the magnet. The
binding posts, F, may be taken from old dry batteries and are
connected to the two wires from the magnet by wires run in grooves
cut in the base.

The base of the key, Fig. 2, is also made of wood and has two
wooden bearings, E, which are made to receive a pivot, similar to
the one used in the sounder. The lever of the key is made of brass
and has a hardwood knob, A, fastened near the end. A switch, D,
connects with the pivot at F and can be either made from sheet
brass, or taken from a small one-point switch. The binding posts
are like those of the sounder, and are connected to the contacts,
K, by wires run in grooves cut in the wood.

[Illustration: KEY-A. wood; B. brass or iron soldered to nail; C.
brass; D. brass: E. wood: F. connection of D to nail; HH. binding
posts]

** How to Make a Music Cabinet [77]

A neat music cabinet can be made as shown in the accompanying
sketch. Each side, AA, Fig. 1, is cut from a board about 36 in. in
length and 16 in. wide. Both are alike and can be cut from the
same pattern. As the front legs curve out a little the main body
of the boards AA should be 15 in. wide. The back, B, should be
about 22 in. long by 16 in. wide and set in between sides AA. Cut
the top, C, 16 in. long and 14-1/2 in. wide. The bottom must be
the same length as the top and 13-1/2 in. wide.

The door, D, can be made panel as shown, or a single piece, 16 in.
wide and about 20 in. long. All material used is to be made from
boards that will dress to 3/4 in. thick.

[Illustration: How to Make a Music Cabinet]

Shelving may be put in as shown in Fig. 2 and made from 1/4-in.
material. Make 12 cleats, E, 13-1/2 in. long, from a strip of wood
1/2 by 3/4 in., with a groove 1/4 by 1/4 in. cut in them. Fasten 6
cleats evenly spaced on the inside of each of the sides, AA, with
3/4-in. brads. This will give seven spaces for music and as the
shelves are removable two places can be made into one.