Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 180
ary flight, makes exactly sixty down and sixty upstrokes per minute. The heron, however, like all other birds when pursuedor agitated, has the power of greatly augmenting the number of beats madeby its wings. 1 The above observation was made at Carlow on the Barrow in OctoberIS37, and the account… … Fig. SI. If, for example, the wing is suddenly depressed in a verticaldirection, as represented at a h, it at once darts downwardsand forwards in a curve to c, thus converting the verticaldown stroke into a down oblique forward stroke. If, again, thewing be suddenly elevated in a strictly vertical…
Animal locomotion · Physiology · Aeronautics
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