Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 206
nt of time,—the middle and upper sets offeathers, which overlap the primary, secondary, and tertiaryones, constituting what are called the coverts and sub-coverts. The primary or rowing feathers are the longest andstrongest (b), the secondaries (a) next, and the tertiaries third(c). The tertiaries,… … towards the extremity of the wing, and so of the several setsof wing-coverts. This arrangement is necessary, because the 182 ANIMAL LOCOMOTION. strain on the feathers during flight increases in proportion totheir distance from the trunk. The manner in which the roots of the primary, secondary,and…
Animal locomotion · Aeronautics
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