puzzles that occupy airship inventors is Leonardo da Vinci, Cayley, Faccioli, and Marey have a curved surface tangentially, tends to "absorb" it. the manner in which a bird, while keeping its wings considered the curvature of the wing, but only as re- It demonstrates why a curved surface, like that… … 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. What is the Third Form of Apparatus. Fig. 12.—Advance of Arti- cause, then, of the great advantages in favor of the ficial Wing Against a Current of Air.…
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