Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 164
. 139 the wing, and by the rotation of the bones of the arm, fore-arm, and hand, upon their long axes. The reaction of theair also assists in the production of the oblique surfaces. That the wing twists upon itself structurally, not only inthe insect, but also in the bat and bird, any one may… … Fio. 65. Fio. 66. eft wing (a, b) of wasp in the act of twisting upon itself, the tipescribing a figure-of-8 track (a, c, 6). From nature.—Original. Fio. 64 shows lef Fins. 65 and 66 show rightwing of blue-bottle fly rotating on its anteriormargin, and twisting to form double or figure-of-8 curves…
Animal locomotion · Aeronautics
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