Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 137
power in the clock—thependulum being used merely to regulate the movements produced by tliedescent of the leads. In watches, the onus of motion is thrown upon aspiral spring; and it is worthy of remark that the mechanician has seizedupon, and ingeniously utilized, two forces largely employed in the… … FIG. 55. If I take two primary feathers and fix them in an ordinarycork, as represented at fig. 55, and allow the apparatus todrop from a height, I find the cork does not fall verticallydownwards, but downwards and forwards in a curve. Thisfollows, because the feathers a, b are twisted flexible…
Animal locomotion · Aeronautics
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