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 (Aptcnodytes minor, Linti.}, adapted exclusivelyfor swimming and diving. In this quaint nird 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…
Animal locomotion · Aeronautics
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