This
trouble may be done away with by departing from the old
single-contact vibrator and using one with self-cleaning contacts
as shown. An old bell magnet is rewound full of No. 26 double
cotton-covered wire and is mounted
[Illustration: Interrupter for Induction Coil]
upon one end of a piece of thin sheet iron 1 in. by 5 in. as per
sketch. To the other end of the strip of iron is soldered a piece
of brass 1/64 in. by 1/4, in. by 2 in., on each end of which has
been soldered a patch of platinum foil 1/4 in. square.
The whole is connected up and mounted on a baseboard as per
sketch, the contact posts being of 1/4 in. by 1/2 in. brass, bent
into shape and provided with platinum tipped thumb screws. The
advantage of this style of an interrupter is that at each stroke
there is a wiping effect at the heavy current contact which
automatically cleans off any carbon deposit.
In the wiring diagram, A is the circuit breaker; B, the induction
coil, and C, the battery.
--Contributed by A. G. Ward, Wilkinsburg, Pa.
** Spit Turned by Water Power [102]
Many of the Bulgarian peasants do their cooking in the open air
over bonfires.
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