At the same time Tom heard the hiss of the gas as it rushed into the envelope from the generating machine, as Ned opened the release valve.
"Now we ought to go up," the young inventor murmured, as he anxiously watched the barograph, and noted the position of the swinging pendulum which told of the roll and dip of the air craft.
For a moment she hung in the balance, neither the increased speed of the propellers, nor the force of the gas having any seeming effect. Mr. Damon and the Russian, clinging to the rudder levers, to avoid being dashed against the sides of the pilot house, held them as far back as they could, to gain the full power of the elevation planes. But even this seemed to do no good.
The power of the gale was such, that, even with the motor and gas machine working to their limit, the Falcon only held her own. She swept along, barely missing the crests of the giant waves.
"She's got to go up! She's got to go up!" cried Tom desperately, as if by very will power he could send her aloft. And then, when there came a lull in the fierce blowing of the wind, the elevation rudder took hold, and like a bird that sees the danger below, and flies toward the clouds, the airship shot up suddenly.
"That's it!" cried Tom in relief, as he noted the needle of the barograph swinging over, indicating an ever-increasing height. "Now we're safe."
They were not quite yet, but at last the power of machinery had prevailed over that of the elements. Through the pelting rain, and amid the glare of the lightning, and the thunder of heaven's artillery, the airship forced her way, up and up and up.
Setting the motor controller to give the maximum power until he released it, Tom hastened to the gas-generating apparatus. He found Ned attending to it, so that it was now working satisfactorily.
"How about it, Tom?" cried his chum anxiously.
"All right now, Ned, but it was a close shave! I thought we were done for, platinum mine, rescue of exiles, and all."