Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 266
rd {Patagona gigas)^ as was pointed out by Darwin, canattain the same object by flapping its large wings with a veryslow and powerful movement. In the larger birds the move-ments are slowed in proportion to the size, and moreespecially in proportion to the length of the wing ; the cranesand… … Fm. 122. Fjg. 122.—Elastic spiral wing, which twists and untwists during its action, toform a mobile helix or screw. This wing is made to vibrate by steam by adirect piston action, and by a slight adjustment can be propelled vertically,horizontally, or at any degree of obliquity. a, h. Anterior…
Animal locomotion · Aeronautics
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