. Animal flight; a record of observation . B. ANIMAL FLIGHT. 179 produce speed ahead. It would flex the wings at thecarpal-joint. Thereby as already shown the secondarieswould be relaxed, and the free or hind ends of thesecondary quills would be pressed upwards by the effect is shown in fig. 51 at B. The ascendingcurrent would be deflected as shown by the resulting force of reaction would then drive the bird ahead. We may now considerthe actual facts of observa-tion. The above-describeddisposition of the wings isseen when the bird wishesto make speed ahead. Butusually the bi
. Animal flight; a record of observation . B. ANIMAL FLIGHT. 179 produce speed ahead. It would flex the wings at thecarpal-joint. Thereby as already shown the secondarieswould be relaxed, and the free or hind ends of thesecondary quills would be pressed upwards by the effect is shown in fig. 51 at B. The ascendingcurrent would be deflected as shown by the resulting force of reaction would then drive the bird ahead. We may now considerthe actual facts of observa-tion. The above-describeddisposition of the wings isseen when the bird wishesto make speed ahead. Butusually the bird wishes toremain in the ascending Cbeel gliding in an ascending current of air at moment ofturn. A shows disposition of the inside wing. B shows dispositionof central portion of outside wing. The reflection of the air currentby this part of the wing is indicated by arrows. The dot in eachfigure shows the position of the centre of gravity. current more or less at one spot, or it glides along thebattlements, heading in a direction of perhaps
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectan, booksubjectflight
