s if glued to the casing. You may now hang your hat on
the end of the pencil.

When you slide the pencil along the casing, do it without any
apparent effort, and it will appear to your audience as though you
had hypnotized it. This is a very neat trick if performed right.
Figure 1 shows the pencil on the casing and Fig. 2 the hat hanging
on it.

[Illustration: Pencil Trick]

** Tying a Knot for Footballs [133]

One of the most prominent English football clubs kept the tying of
this knot on the rubber hose of their football a secret and never
allowed all of its members to know how it was tied. This tie can
be used on grain sacks, and in numerous other like instances. Make
one loop in the cord and then another exactly the same way, as

[Illustration: A Secure Knot]

shown in Fig. 1, placing the end of the cord under the first loop,
then pulling at each end of the cord as in Fig. 2.--A.E.J.

** Stove polish [133]

Stove polish consists of 2 parts graphite, 4 parts copperas and 2
parts bone black, mixed with water to form a paste.

** How to Give an Electric Shock While Shaking Hands [133]

There is nothing quite so startling as to receive an electric
shock unexpectedly and such a shock may be given to a friend while
shaking hands upon meeting. The shock produced is not harmful and
the apparatus can be carried in the pocket. It consists of a small
induction coil that can be constructed at home.

The core of the coil, A, Fig. 1, is constructed in the usual
manner, of small soft-iron wire to make a bundle about 3/16 in. in
diameter and 2 in. long. The coil ends are made from cardboard,
about 1 in. in diameter, with a 3/16-in. hole in the center. The
hole

[Illustration: Details of Induction Coil]

should be cut as shown in Fig. 2, so as to have four small pieces
that can be bent out, leaving the projections as shown. After
wrapping three or four turns of paper around the bundle of wires
the cardboard ends are put on with the projections inside, so the
coils of wire will hold them in place. About 70 turns of No. 24
gauge double covered magnet wire is first placed on the core, for
the primary, and then 1,500 turns of No. 32 or 34 gauge
double-covered wire is wrapped on top of the primary, for the
secondary. Sufficient length of wire must be left outside at each
end of both windings to make connections. The vibrator B, Fig. 1,
and the support C are made from thin spring steel, about 1/8 in.
wide, b