"
"They have fine machines," agreed the other.
"Yes; and they are equipped with a balancing device that makes them much
more reliable than ours."
"A balancing device!" exclaimed the Cuban, as the two men got into the
car, a small yellow runabout of racy appearance.
"That's what I said, and it's a good one, too. I read an account of it
in an aviation paper; but the description was too sketchy for me to see
how the thing was worked."
"Those boys must be wonders."
"I'm afraid they are. That's why we've got to be careful of them. But
I've got a plan to fix them, the whole lot of them."
"What is it?"
"I'll tell you as we go along."
As the car rolled past the group of aeroplanes with Jake faithfully
standing guard over them, Kelly hailed him in a suave voice.
"Any idea where the young folks have gone?"
Jake, who had no idea that Kelly had a sinister motive in asking the
question, replied readily enough.
"Yes, they've gone into Millbrook to get another spark plug. Something
happened to one of the plugs of that red machine yonder.
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