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INDUCTION COILS 207

The condenser may be home-made. It consists of al-
ternate sheets of tinfoil and paraffined paper, arranged in
a pile as shown in the illustration. The following table
gives the proper sizes for condensers for three diflerent
coils.

TINFOIL
SIZE or SPARK-COIL N0. SHEETS SIZE OF SHEETS
% inch 50 2 x 2
1 inch 100 7 x 5
1% inch 100 8 x 6

The paper must be about one-half inch larger all the
way around, so as to leave a good margin. The alternate
Sheets of tinfoil, that is, all on one side and all on the other,
a r e connected.
The condenser is
c o n n e c t e (1 di-
rectly across the
terminals of the
interrupter.

There are vari-
ous methods of
mounting a coil, the most common being to place it in a
box with the interrupter at one end. Perhaps, however,
one of .the' neatest and also the simplest methods is to mount
it in the ,’manner Shown in the illustration.

The end-pieces are cut out of wood. No specific dimen-
sions can be given, because the diameter of the coils will
vary so. ewhat according to who winds them and how
tightly [Key are made. The coil is enclosed in a tube made

 

 

 

FIG. 165. — Condenser.

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