"Here is this chimney in the rock about which Tom spoke," Jack pointed
out. "They have hooked up through this. And the antenna, I suppose, is
on top of the rock above us.
"This arc," he continued, advancing to the coils, "looks pretty strong
and seems to have a rather elaborate water-cooling system. I think it
is of foreign design, probably German. The Germans were early in the
field with radio telephony development, you know."
"All right," said Bob, who was beginning to grow impatient, "I'll take
your word for it. But what I want to know is, can we telephone my
father at your ranch?"
"Say, Bob, I'm sorry," Jack said quickly. "You know how crazy Dad and
I are over this radio telephone. But, of course, you are anxious to
get your father. Come on, let's try. I'll throw on the generator."
Suiting action to words, Jack shortly had the generator at work, while
Bob began calling through the air for his father.
"Be careful to use our code," Jack warned him. "You know Rollins said
these fellows had a powerful radio station at the Calomares ranch, and
if they were to pick up your call and listen in there'd be trouble."
"Right," said Bob. "But if Dave answers the signal, I'll have to ask
for father, because Dave doesn't understand the code.
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