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256 THE BOY ELECTRICIAN

of which are shown in Figure 205. One of the heads, B,
has a flanged hole two and three-quarter inches in diameter
cut through the center so as to receive the end of the tube
and permit the secondary to pass inside.

 

 

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each of 6910: R008

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Details of Primary Heads
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Base

FIG. 205.— Details of the Wooden Parts.

The secondary winding is composed of a single layer of
No. 28 B. & S. gauge silk-covered wire and divided into
six equal sections. The secondary is supported by two
circular wooden pieces, C and F, and slides back and forth
on two guide-rods. The guide-rods should be brass. Iron or

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