Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 151
breeze—the windand the inclined planes resulting from the upward inclination of the wingsreacting iipon each other, with this very remarkable result, that the mass ofthe bird moves steadily forwards in a more or less horizontal direction. 12G ANIMAL LOCOMOTION. and extensive surfaces,—weight in… … FIG. 59.—The Red-legged Partridge (Perdix rubra) with wings fully extendedas in rapid flight, shows deeply concave form of the wings, how the primaryand secondary feathers overlap and support each other during extension,and how the anterior or thick margins of the wings are directed upwardsand…
Animal locomotion · Aeronautics
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