"Here," he explained, "we can make a safe landing. It is an ideal
place for a camp, with plenty of firewood and water."
"And meat, too," interrupted Alan, pointing to the deer.
"Venison and bear meat too, no doubt," laughed Ned.
From the top of a dead pine tree an eagle rose and soared lazily
away.
"It's like the camping out places you read about," exclaimed Bob.
"That eagle nest completes the picture."
"It does," interrupted Ned, "and I hope you won't forget the
picture. That high, barren tree is your landmark. Some day you may
need it. Remember; from the valley below your camp can be found by
locating the little waterfall on the cliff. From the timber line
above you will know it when you see the eagle's nest. And now let
go the anchor. We have no gas to spare, and can't afford to open
the valve."
To make a landing in a balloon without throwing open a valve and
wasting precious gas is almost impossible. The craft could only be
kept near the ground by keeping it in motion or by causing the
propeller fans to depress currents of air on the aeroplanes.
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