The armature is made from a soft piece of iron, about
3/16 in. in diameter and 1/16 in. thick, which is soldered to the
end of the vibrator directly opposite the end of the core. A small
screw is fitted in the end of the support, C, for adjustment,
which should be tipped with platinum and also a small piece of
platinum placed where the screw will touch the vibrator, B.
One of the primary wires is connected to the screw support. The
vibrator, is connected to a flash lamp battery, D. The other
primary wire is connected to a switch, S, which in turn is
connected to the other terminal of the battery. The switch, S, may
be made from a 3/8-in. cork with the wires put through about 3/16
in. apart and allow them to project about 1/2 in. The plate E is
cut about 1/2 in. square from a piece of copper and is fastened to
the heel of one shoe and connected with a wire from the secondary
coil which must be concealed inside of the trouser leg. The other
secondary wire is connected through the coat sleeve to a finger
ring, F. The vibrator screw must be properly adjusted. When the
vibrator is not working the armature should be about 1/16 in.
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