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Robert Hooke is less conspicuous than either Borelli or Lana; his work, which came into the middle of the seventeenth century, consisted of various experiments with regard to flight, from which emerged 'a Module, which by the help of Springs and Wings, raised and sustained itself in the air. This must be reckoned as the first model flying machine which actually flew, except for da Vinci's helicopters; Hooke's model appears to have been of the flapping-wing type he attempted to copy the motion of birds, but found from study and experiment that human muscles were not sufficient to the task of lifting the human body.
On and on toward the approaching shores of Africa drifted the wounded Eagle of the Sky, making no headway save such as the west wind gave her. Steadily the needle of the altimeter kept falling. The high-pitched drone of the helicopters told that the crippled engines were doing their best; but even that best was not quite enough. Like a tired creature of the air, the liner lagged, she sank.
After several helicopters of their own, the brothers made original models of kites, and Orville, the younger, attained an exceptional skill in flying them. Presently Orville and Wilbur were making their own bicycles and astonishing their neighbors by public appearances on a specially designed tandem.
Gertie was miles back, concealed behind piles of triplanes and helicopters and following-surface monoplanes which the wizard inventor, C. Ericson, was creating and ruthlessly destroying.... A small boy was squalling in the seat opposite, and Carl took him from his tired mother and lured him into a game of tit-tat-toe.
We are beginning to make helicopters, like the one Loudons and I came in. We'll furnish your community with one or more of them. We can give you a radio, so that you can communicate with other communities. We can give you rifles and machine guns and ammunition, to fight the the Scowrers, did you call them? And we can give you atomic engines, so that you can build machines for yourselves."
There were cross ribs which gave us a footing, and occasionally projections streamline fin-tips, the casings of the upper rudder shafts, and the upstanding stubby funnels into which helicopters were folded. We moved along the central footpath and crouched by a six-foot casing. The stars and the glowing Earth were over us.
The only witnesses were the Arabian Desert stars; the only requiem the droning of the helicopters far above, where Nissr hung with her gleaming lights like other, nearer stars in the dense black sky. By ten o'clock, the air-liner had resumed her course, leaving still another brave man to his last sleep, alone. The routine of travel settled down again on the ship and its crew of adventurers.
The roar of the propellers lessened; and at the same time, the increasing hum of the helicopters made itself heard, counterbalancing the loss of lifting power of the planes, yet gradually letting the air-liner sink. Came, too, a sighing hiss of the air-intakes as the vacuum-floats filled. High noon was now at hand. The sun burned, a copper ball, in the very forehead of a turquoise sky.
Helicopters brought some Bulgarians down, by the way, and oxygen brought them to. So naturally they gave us the same treatment. Very effective." The colonel looked both chastened and truculent. "How'd you know Major Pangalos for what he was? He was accepted everywhere as a man." "His eyes were queer," said Coburn. He stood up experimentally. "I figured they would be, if one looked.
But always they remarked that "the model from which the machine will be built has flown perfectly in the presence of some of the most prominent men in the locality." These machines had a great deal to do with the mysterious qualities of gyroscopes and helicopters. Now, Dr.
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