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 ( VaneUus crisiatus, Meyer), with onewing (c ft, d e f) fully extended, and forming a long lever; the other (d ef,c l>) being in a flexed condition and forming a short lever. In the extendedwing the anterior or thick margin (d«/) >s directed upwards and…
Animal locomotion · Aeronautics
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