Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 183
o elapse between them, beget a corresponding series ofup impulses, in accordance with the law of action and re-action ; the wing and the air under these circumstances beingalternately active and passive. I say if a certain intervalwere allowed to elapse between every two down strokes, but 158… … Fig. 83. Figs. 82 and 83 show that when the wings are elevated (e,/, g of fig. 82) thebody falls (s of fig. 82); and that when the wings are depressed (h, i, j offig. 83) the body is elevated (r of fig. 83). Fig. 82 shows that the wings areelevated as short levers (e) until towards the termination…
Animal locomotion · Aeronautics
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