ssage," replied Harvey. "The signal keeps on going through the ether
until it strikes that other antenna. Then it climbs along it until it
reaches the receiving set and registers the same kind of dot or dash as
the one I made at this end. It's like the pitcher and catcher of a
baseball battery. One pitches the ball and the other receives the same
ball. At one instant it's in the pitcher's hand and the next it has
traveled the space between the two and is resting in the catcher's hand.
Sounds simple, doesn't it?"

"Sounds simple when you put it that way," laughed Larry. "But I have a
hunch that it isn't as simple as it sounds."

"Well, to tell the truth, it isn't quite as simple as that," confessed
Harvey. "There's a whole lot to learn about receiving and transmitting and
detectors and generators and condensers and vacuum tubes and all that. But
my point is that there's nothing of the really essential things that are
concerned in getting entertainment and instruction from radio that can't
be learned with a little application by any one of ordinary
intelligence."

"I wonder if I'm in that class," said Larry quizzically, and there was a
general laugh.

Another half hour was spent with great profit and interest in the sending
station and then the boys arose to go.

"How are you getting along with that regenerative set?" asked Mr. Harvey
of Bob.

"Pretty well, thank you," answered Bob. "It's the proper adjusting of the
tickler that's giving me the most trouble."

"Be careful not to increase it too far," warned Harvey. "If you do, the
vacuum tube oscillates and becomes a small generator of high frequency
current and in that way will interfere with other near-by stations. Then,
too, the speeches and music will be mushy instead of being clear. Drop in
again when you have time and we'll talk the matter over a little
further."

The visitors bade their host farewell and trooped out into the bright
sunshine. Larry and Tim were enthusiastic over the new world into which
they had been introduced.

"The most wonderful thing in the world," was their verdict.

They spent the rest of the morning on the beach, and before they parted,
Larry had secured a promise from the radio boys to come over to a dance
that was to be held the next night at the hotel where he and Tim were
stopping.

"Jolliest kind of fellows, aren't they?" said Joe.

"They sure are," agreed Herb. "I should think that free and easy life of
theirs would be