With a few deft movements the doctor attached the various parts of
the apparatus to their proper places on the baseboard. There was
not time that day to put up the aerial, but he gave them practical
illustrations of how to use the detector by pressing the point of the
wire firmly against the crystal, how to slide the rings back and forth
until they found the point of greatest loudness and clearness, and all
other points essential to using the set successfully. Not all the boys
caught on to all that was involved, but to the majority it was made
reasonably clear. To Bob and Joe, who had followed every point of
the demonstration with the keenest attention, the operation of the
receiving set was made as clear as crystal, and they had no doubt
of their ability to construct a set for themselves. Herb's attention
had wandered somewhat, because in the back of his mind there still
lurked the idea of buying a set ready made. Jimmy had been somewhat
distracted by looking about in various parts of the barn to see if he
could detect the presence of any "eats," and his ideas were somewhat
hazy in consequence.
"Well, boys," at last said the doctor, with a smile, "I guess we'll
call it a day. But remember that if at any time you are puzzled and
want more information all you have to do is to come and ask me.
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