The Encyclopaedia Britannica; ..A dictionary of arts, sciences and general literature . a steamengine, with twin-screw propellers, and without gasor other lifting aid. Its total weight is about fortypounds. In November, 1898, the United StatesBoard of Ordnance appropriated $25,000 to enableProf. Langley to develop his ideas, with a view to theuse of his machine for war purposes. He has pub-lished a pamphlet on The Internal Workoftlu Wind,and shown that the wind is very uncertain, var>inganiazmgly in velocity within short periods of , Von Sigsfeld, and Von Parsfal, of Augs-burg
The Encyclopaedia Britannica; ..A dictionary of arts, sciences and general literature . a steamengine, with twin-screw propellers, and without gasor other lifting aid. Its total weight is about fortypounds. In November, 1898, the United StatesBoard of Ordnance appropriated $25,000 to enableProf. Langley to develop his ideas, with a view to theuse of his machine for war purposes. He has pub-lished a pamphlet on The Internal Workoftlu Wind,and shown that the wind is very uncertain, var>inganiazmgly in velocity within short periods of , Von Sigsfeld, and Von Parsfal, of Augs-burg, Bavaria, made extensive and costiv trials ofmodels designed for automatic flight. Charles and J. B. Millet have experimented withkites of the Hargrave type, and the former has in-wnted a multiplane folding kite. Professor Georgewellner, of Briinn, Austria, designed, in 1893, anairship to be supported by sections of tubing ofvery large diameter, within which rotate sail-wheelsot a peculiar pattern. He has patented these sail-wheels. Between 1S90 and 1S93 Horatio Phillips,. ^ A E R O P H O R E — A F G H A N I S T A N 57 of England, made many ex])eriinents with an aero-plane apparatus, which he wliirled around on a cir-cular track. His machine weighed 350 pounds, andhad a series of aeroplanes arranged somewhat likethe slats of a Venetian blind. These slats were 22inches wide, and curved in imitation of the wing ofan albatross. He constructed a propeller to drivethis machine, but never succeeded in making it self-sustaining. Other recent machines are the Zappe-lin air-ship and Santos-Dumonts dirigible balloon. Notable investigations on atmospheric move-ments have been made by Helmholtz of Berlin, andLord Rayleigh of England, each of whom has con-tributed to the literature on the subject. SeeAeronautics, Vol. I, pp. 185-207. AEROPHORE. See Coal, Vol. VI, p. 73. AEROPHYTES, plants which derive all theirsustenance from the air, as certain orchids andbromelias. Among the l
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