Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 116
the angle or obliquity neces-sary for sending the animal forward. This angle, I mayobserve, corresponds with that made by the foot during ex-tension, so that, if the feet and wings are both employed,they act in harmony. If proof were wanting that it is theback or convex surface of the wing which… … Fig. 46.—The Little Penguin (Aptenodytes minory Linn.), adapted exclusivelyfor swimming and diving. Tn this quaint Dird the wing forms a perfectscrew, and is employed as such in swimming and diving. Compare withfig. 37, p. 70, and tig. 44, p. 89.—Original. round in order that the concave surface,…
Animal locomotion · Aeronautics
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