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158 THE BOY ELECTRICIAN

The yoke is made of enough strips of sheet-iron, one-half
inch wide and two inches long, to form a pile one-quarter
of an inch thick. Two one-quarter-inch holes are bored in
the opposite ends of the yoke, one and one-half inches apart.
The lower ends of the magnet cores are passed through

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FIG. 136. —Details of the Telegraph Set shown in Figure I 35.

these holes. The ends should project one-half of an inch
beyond the yoke.

They are passed through two holes in a base-board three-
quarters of an inch thick. The holes are countersunk
from the lower side, so that a nut can be screwed on the
lower end of each and the magnets held tightly in an up-
right position. The remaining parts of the instrument are
very easily made, and are so clearly shown by the drawing
that it is hardly necessary to say more than a few words in
explanation.

The lever or tongue, the anvil, the standard, and the
lever of the key are all cut out of hard-wood according to
the pattern shown in the illustration.

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