Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics (1873)
Pettigrew, James Bell, 1834-1908 · London : Henry S. King & Co. · leaf 90
. 5. sm. 4to, 2 vols. Roma?,1680. PROGRESSION ON AND IN THE WATER. b i motion. According to this theory the tail, when flexed orcurved to make what is termed the back or non-effectivestroke, is forced away from the imaginary line, its curved,concave, or biting surface being directed outwards.… … I Fig. 31.—Swimming of the Fish.—(After Borelli.) When the tail strikes in the direction a i, the head of thefish is said to travel in the direction c h. When the tailstrikes in the direction g e, the head is said to travel in thedirection c b; these movements, when the tail is urged withsufficient…
Animal locomotion · Physiology · Aeronautics
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