Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 258
ngs forming a cone whose base is repre-sented by cbe of fig. 113, p. 220); its apex being repre-sented by af of the same figure. The base of Borellis cone,it will be observed, is inclined forwards in the direction of AERONAUTICS. 231 the head of the bird. Now this is just the opposite of whatought… … Fm. 116. In this figure the action of the wing is compared to thesculling of an oar, to which it bears a considerable resem-blance.1 The one cone, viz., that with its base directed out-wards, is represented at x b d. This cone corresponds to thearea mapped out by the tip of the wing in the process…
Animal locomotion · Aeronautics
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