 | Charles Darwin - 1846 - 716 페이지
...neck, body, and tail acted. If the bird wished to descend, 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... | |
 | Philip Henry Gosse - 1849 - 344 페이지
...blue sky. The head and neck were moved frequently, and apparently with force; and it appeared as if the extended wings formed the fulcrum on which 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... | |
 | Perry Fairfax Nursey - 1853 - 516 페이지
...birds flap its wings : " if the bird wished to descend, the wings were for a moment collapsed, and then again expanded with an altered inclination, the momentum...with the even and steady movement of a paper kite." Any person may observe the latter phenomenon in the flight of the common gull. I have myself seen the»;... | |
 | 1853 - 564 페이지
...birds flap its wings : " if the bird wished to descend, the wings were for a moment collapsed, and then again expanded with an altered inclination, the momentum...with the even and steady movement of a paper kite." Any person may observe the latter phenomenon in the flight of the common gull. I have myself seen them... | |
 | John George Wood - 1862 - 804 페이지
...blue sky. The head and neck were moved frequently, and apparently with force, and it appeared as if the extended wings formed the fulcrum on which the...to urge the bird upwards with the even and steady movements of a paper kite. In case of any bird soaring, its motion must be sufficiently rapid, so that... | |
 | John George Wood - 1862 - 804 페이지
...blue sky. The head and neck were moved frequently, and apparently with force, and it appeared as if the extended wings formed the fulcrum on which the...to urge the bird upwards with the even and steady movements of a paper kite. In case of any bird soaring, its motion must be sufficiently rapid, so that... | |
 | John George Wood - 1862 - 804 페이지
...blue sky. The head and neck were moved frequently, and apparently with force, and it appeared as if the extended wings formed the fulcrum on which the...to urge the bird upwards with the even and steady movements of a paper kite. In case of any bird soaring, its motion must be sufficiently rapid, so that... | |
 | John George Wood - 1831 - 802 페이지
...wings formed the fulcrum on which the movements of the neck, body, and tail acted. If the bird wjshed to descend, the wings were for a moment collapsed,...to urge the bird upwards with the even and steady movements of a paper kite. In case of any bird soaring, its motion must be sufficiently rapid, so that... | |
 | Aeronautical Society of Great Britain - 1883 - 488 페이지
...neck, body, and tail acted. If the bird wished to descend, the wings were for a moment collapsed, and when again expanded with an altered inclination, the...gained by the rapid descent seemed to urge the bird upward with the even and steady movement of a paper kite. In the case of any bird soaring, its motion... | |
 | Henry Mills Alden, Frederick Lewis Allen, Lee Foster Hartman, Thomas Bucklin Wells - 1871 - 968 페이지
...neck, body, and tail acted. If the bird wished to descend, the wings were collapsed for a moment, and when again expanded with an altered inclination the...gained by the rapid descent seemed to urge the bird upward with the even and steady movement of a paper kite. In the case of any bird soaring its motion... | |
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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.... 
