Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 170
the reciprocating and non-reciprocating action of the wing in such cases is purely amatter of speed. If the travel of the wing is greater than thehorizontal travel of the body, then the figure-of-8 and thereciprocating power of the wing will be more or less perfectlydeveloped, according to… … Fig. 74. Fig. 75. Figs. 74 and 75 show the more or less perpendicular direction of the stroke of thewing in the flight of the bird (gull)—how the wing is gradually extended as itis elevated {e f g of fig. 74)—how it descends as a long lever until it assumesthe position indicated by h of fig. 75—how…
Animal locomotion · Aeronautics
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