1891. hopper, which are learning to fly. more than a score of successful aeroplane models. Since 1891, when Lilienthal, aftei% twenty years of Lilienthal proved that a slightly convex surface of $ Penaud, in 1871, invented the first successful aeroplane with a flexible 20 square meters, inclined… … 'She Motor and Propeller of Aeroplane No. 6, designed A Flight That Ended in a Fall Because the Wind's Direction Had Not by Capt. Ferber. Been Considered. THE PROGRESS OF AVIATION SINCE 1891.—CAPT. FERBER'S EXPERIMENTS.
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