Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 172
vements of the wrist are always the converse of thoseoccurring at the elbow-joint. Thus in the bird, during ex-tension, the elbow and boues of the forearm are elevated, anddescribe one side of an ellipse, while the wrist and bones ofthe hand are depressed, and describe the side of anotherand… … Flexion (elbow). Extension (wrist). Fig. 79.—(a h) Line along which the wing travels during extension and flexion.The body of the fish in swimming describes similar curves to those describedby the wing in flying.—(Fic^e fig. 32, p. 68.) The Wing capable of Change of Form in all its Parts,—Fromthis…
Animal locomotion · Aeronautics
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