Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 149
he windand the inclined planes resulting from the upward inclination of the wingsreacting upon each other, with this very remarkable result, that the mass ofthe bird moves steadilv forwards in a more or less horizontal direction. L26 ANIMAL LOCOMOTION. and extensive surfaces,—weight in either case… … 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 · Physiology · Aeronautics
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