"Let's go downstairs and see what we can do."
They all made their way to Bob's workroom in the basement, where they
found the core well dried and the wire as firmly set on it as the most
particular workman could desire.
"Good enough!" exclaimed Bob, examining the core with loving pride.
"We'll get this set up in a jiffy, and then we can make the
condenser."
Working together, the boys soon had two square blocks sawn out as end
pieces, and they centered the core on these and screwed it fast. Then
they drilled holes in the two upper corners of the square end pieces
to fit two brass rods they had bought at the hardware store. These
rods carried each a small sliding spring, or contact, which rubbed
along the length of the tuning coil, one on each side. After they had
bolted the brass rods securely in place, the coil was ready for use,
except that the boys had first to scrape off the insulating enamel in
the path of the sliding contacts, so that they could reach the copper
coils. A sharp pen knife soon effected this, and the boys found
themselves possessed of a neat, substantial tuning coil, at a cost
of only a fraction of what it would have been if they had had to buy
a coil already made. And in addition they had the satisfaction that
comes of a good job well done, which more than compensated them for
the labor involved.
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