Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 168
Fig. Fig. Figs. 74 and 75 show the more or less perpendicular direction of the stroke ofthe wing in the flight of the bird (gull)—how the wing is gradually extended asit is elevated (efg of fig. 74]—how it descends as a long lever until it assumesthe position indicated by h of fig. 75—how it is…
Animal locomotion · Physiology · Aeronautics
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