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Then he went on to explain that flight without gas bags would require the discovery of some new material or a new force in nature. And at the same time Rear Admiral George W. Melville, then Chief Engineer for the U.S. Navy, said that attempts to fly heavier-than- air vehicles was absurd. Just a little over ten years ago there was another "it can't be."
THERE are three distinct types of heavier-than- air machines, which are widely separated in all their characteristics, so that there is scarcely a single feature in common. Two of them, the aeroplane, and the orthopter, have prototypes in nature, and are distinguished by their respective similarities to the soaring birds, and those with flapping wings.
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