And, as has been explained, the harder the wind blew the better the air glider worked. In fact unless there was a strong gale it would not go up.
"But it will be just what is needed out there in that part of Siberia," declared the exile, "for there the wind is never quiet. Often it blows a regular hurricane."
"That's what we want!" cried Tom. He had made several models of the air glider, changing them as he found out his errors, and at last he had hit on the right shape and size.
Midway of the big glider, on which work was now well started, there was to be an enclosed car for the carrying of passengers, their food and supplies. Tom figured on carrying five or six.
For several weeks the work on the air glider progressed rapidly, and it was nearing completion. Meanwhile nothing more had been heard or seen of the Russian spies.
"Well," announced Tom one night, after a day's hard work, "we'll be ready for a trial now, just as soon as there comes a good wind."
"Is it all finished?" asked Ned.
"No, but enough for a trial spin. What I want is a big wind now."