 | Stephen B. Goddard - 2003 - 236 페이지
...acted. If the bird wished to descend," Darwin ruminated, "the wings were for a moment collapsed; and when again expanded with an altered inclination, the...with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid, so that the action of the inclined... | |
 | 1894 - 710 페이지
...of the neck, body, and tail acted. If the bird wished to descend, the wings for a moment collapsed J and then, when again expanded, with an altered inclination,...with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid so that the action of the inclined... | |
 | 1920 - 1174 페이지
...its wings. He says that, if the bird wished to descend, the wings were for a moment collapsed; and when again expanded, with an altered inclination,...with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid for the action of the inclined... | |
 | Sir Norman Lockyer - 1883 - 724 페이지
...descend, the wings were'for a moment collapsed ; and when again expanded with an altered ii clination, the momentum gained by the rapid descent seemed to...with the even and steady movement of a paper kite. In the case of any bird soaring, ils motion must be sufficiently rapid, so that the action of the inclined... | |
 | Sir Norman Lockyer - 1883 - 892 페이지
...expanded with an altered inclination, the moaientuin gained' by the rapid descent seemed to urge ihe bird upwards with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid, so that the action of the inclined... | |
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If the bird wished to descend, the wings were for a moment collapsed; and then when again expanded with an altered inclination, the momentum gained by the rapid descent seemed to urge the bird upwards, with the even and steady movement of a paper kite.... 
