Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 270
It thus evades the air during the upstroke. During the down stroke of the piston the wing isflattened out in every direction, and its extremities twistedin such a manner as to form two screws, as shown at a b c d!;^ f g li; B^B of figure. The active area of the wing is bythis means augmented, -the… … -m Fig. 126- 244 AERONAUTICS. The degree of convexity given to the upper surface of thewing can be increased or diminished at pleasure by causing acord (iy; A, A) and elastic band (k) to extend between twopoints, which may vary according to circumstances. Thewing is supplied with vertical springs,…
Animal locomotion · Aeronautics
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