Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 114
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 minor, Linn.\ adapted exclusivelyfor swimming and diving. In this quaint bird the wing forms a perfectscrew, and is employed as such in swimming and diving. Compare withfig. 37, p. 7G, and fig.44, p. SQ.—Original. round in order that the concave surface,…
Animal locomotion · Physiology · Aeronautics
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