AERONAUTICS: A Successful Helicopter

". . . So far as I know, you have produced the first successful helicopter." This is a fragment of the congratulatory message sent by Thomas A. Edison offering assistance in further experiments to Dr. Bothezaat, who broke the world's helicopter record at McCook's Field, Dayton, Ohio, by remaining in the air two minutes and 45 seconds at a height of 15 feet.

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