from
the core and directly opposite.
The coil when complete will be about 2-1/2 in. long and 1 in. in
diameter. The coil can be placed in an old box that has been used
for talcum powder or shaving stick. The space around the coil in
the box can be filled with paper to keep it tight.
The coil and battery are carried in the pockets and the cork
button put in the outside coat pocket, where it can be pressed
without attracting attention.
** Experiment with Heat [134]
[Illustration: Heat Experiment]
Place a small piece of paper, lighted, in an ordinary water glass.
While the paper is burning turn the glass over and set into a
saucer previously filled with water. The water will rapidly rise
in the glass, as shown in the sketch.
** How to Attach a Combination Trunk Lock [134]
[Illustration: Trunk Lock]
A small combination lock for chests can be purchased for a small
sum of money and attached to a trunk cover after first removing
the old lock as shown in Fig. 1. It is necessary to add 1/2-in. to
the thickness of the trunk lid or cover. This may be done by
placing a brass plate 1/8-in.
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