of. Langley, in a very interesting article in the Scientific American Supplement, demonstrated in a graphic manner the great difference that had already been observed by Cayley, Chanute, Marey, and others Fig. 9.—Second Form of Apparatus. Figs, lo and 11.— between a bird's wings and aeroplanes.… … will move in opposite directions, that is to say, the Fig. 13.—Mode of Suspension of Artificial Wing. Fig. one placed at the center of the wing will approach the The Bertelli Apparatus for Experimenting: Upon the Mode 14.—Advance of Wing Against Wind Pressure. Fig. latter and become perpendicular…
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