"Whew! It's getting warm," suddenly announced the youth, and he let go of the steering wheel for a moment, while he took off his coat.
"That's what it is," agreed Mr. Damon, who also divested himself of his garments. "Bless my spark plug, but it's like a July day. No wonder there's a thunderstorm ahead."
Then Mr. Sharp uttered a cry. "That's no storm!" he fairly shouted. "It's a big forest fire! That's smoke we see! We must get out of this. Turn around Tom, while I start the engine. We must rise above it!"
He fairly leaped for the motor, and Tom and Mr. Damon could hear him turning the levers and wheels, ready to start. But before the explosions came something happened. There was a sound as of some great, siren whistle blowing, and then, with a howl of the on rushing air, the Red Cloud, the propellers of which hung motionless on their shafts, was fairly sucked forward toward the fire, as the current sucks a boat over a water fall.
"Start the motor! Start the motor, Mr. Sharp!" cried Tom.
"I'm trying to, but something seems to be the matter."
"We're being drawn right over the fire!" yelled Mr. Damon. "It's getting hotter every minute! Can't you do something?"
"You take the wheel," called the balloonist to Mr. Damon. "Steer around, just as if it was an auto when we start the engine. Tom, come here and give me a hand. The motor has jammed!"
The young inventor sprang to obey. Mr. Damon, his face showing some of the fear he felt, grasped the steering wheel. The airship was now about a quarter of a mile high, but instead of resting motionless in the air, sustained by the gas in the container, she was being pulled forward, right toward the heart of the mass of black vapor, which it could now be seen was streaked with bright tongues of flame.
"What's making us go ahead, if the motor isn't going?" asked Tom, as he bent over the machine, at which the aeronaut was laboring.