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
ze—the windand the inclined x^lanes resulting from the upward inclination of the wingsreacting upon each other, with this very remarkable result, that the mass ofthe bird moves steadily forwards in a more or less horizontal direction. ) 126 ANIMAL LOCOMOTION. . and extensive surfaces,—weight in… … Fig. 59.—The Red-legged Partridge (Perdix rubra) with wings fully extendedas in rapid flight, shows deeply coneave 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 diiected upwardsand…
Animal locomotion · Aeronautics
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