e short leg and two gesturing
hands and had labeled it "Bill Brown, radio radiator." Bill made a
motion of his thumb toward the caricature, then spread his hands in mock
despair, but not without a side glance expressing pride in his
lieutenant's performance, all of which pleased the audience immensely.

Then Bill proceeded: "This electro-motive force which travels around and
through our little earth is what we can actually experiment with. We do
not know just what it is, but we are finding out pretty fast what it
will do. Perhaps there is hardly any limit to what it will do. It is
generated for power and light and heat, for carrying signals and sounds
over wires and through the air. What next? Just now we have got all the
thinking we can do about radio. It is the sixth wonder that electricity
has sprung upon us. I guess we won't include electrocution.

"Now, there's no use going into technicalities about construction,
that's a thing that must be studied out and thought over, not mussed up
in a talk like this. I'll say this much, however, it is the vacuum or
audion tube detector that gives results, and the application of a loud
speaker is only possible with a vacuum or audion tube. It is as easy to
build a vacuum tube set as a crystal set and only a very little more
expensive. So, whether you are building or buying a set, make it a good
set, something that you can hear with a good many hundred miles.

"Now, you can buy the parts and build a receiving set that will
generally give more satisfaction than a bought set." (Bill stepped over
to the blackboard and took up a pointer.) "I may need this for this
partner of mine if he persists in caricaturing me instead of drawing
what we want. We'll make things about four times as big as they ought to
be. You can use an aerial outdoors, which everybody now understands,
or, just as well and a lot handier, a loop aerial indoors, the bigger
the better, but two feet in diameter is big enough.

"Here is your base and upright panel and this is the way to hook up or
wire the parts. Here's your aerial and its ground, between which is
placed your variable condenser and tuning coil, thus, off here between
condenser and coil comes the wire to your vacuum tube, with its fixed
condenser and grid leads, the wire being connected directly to the grid,
while here the wire from the tube plate is connected with the six-volt
storage battery and in turn with the phones, like this. Then, from the
pho