Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 182
ry 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. ^ The above observation was made at Carlow on the Barrow in OcLobur1867, and the account of… … 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 thus converting the verticaldown stroke into a doivn oblique forward stroke. If, again, thewing be suddenly elevated in a strictly vertical direction,…
Animal locomotion · Aeronautics
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