Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 255
<l … As a consequence, the bird will be more vigorously depressedduring the ascent of the wing than it will be elevated duringits descent. That the mechanical wing referred to by Borelliand Marey is not a flying wing, but a mere propelling ap-paratus, seems evident to the latter, for he states that…
Animal locomotion · Aeronautics
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
