Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 161
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 b, d e f) fully extended, and forming a long lever ; the other (d ef,c b) being in a flexed condition and forming a short lever. In the extendedwing the anterior or thick margin (d e /) is directed upwards and…
Animal locomotion · Physiology · Aeronautics
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