Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 163
rmediate degrees of obliquity. All wingsobtain their leverage by presenting oblique surfaces to theair, the degree of obliquity gradually increasing in a directionfrom behind forwards and downwards during extension andthe down stroke, and gradually decreasing in an oppositedirection during flexion… … Fig. 63.— The Lapwing-, or Green Plover ( Vanellus cristatus, Meyer), with onewing (c 6, d e f) fully extended, and forming a long lever; the other {d e /,c b) being in a flexed condition and forming a short lever. In the extendedwing the anterior or thick margin {d e f) is directed t^j9w«rcZs and…
Animal locomotion · Aeronautics
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