 In the case of any bird soaring, its motion must be sufficiently rapid, so that the action of the inclined surface of its body on the atmosphere may counterbalance its gravity. The force to keep up the momentum of a body moving in a horizontal plane in...  Philosophical Magazine - Page 4281894Full view - About this book
 | Charles Darwin - Beagle Expedition - 1846 - 716 pages
...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...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Aeronautical Society of Great Britain - Aeronautics - 1883 - 488 pages
...with an altered inclination, the momentum gained by the rapid descent seemed to urge the bird upward with the even and steady movement of a paper kite....momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Henry Mills Alden, Frederick Lewis Allen, Lee Foster Hartman, Thomas Bucklin Wells - 1871 - 980 pages
...with an altered inclination the momentum gained by the rapid descent seemed to urge the bird upward with the even and steady movement of a paper kite....momentum of a body moving in a horizontal plane in the air (in which there is so little friction) can not be great, and this force is all that is wanted.... | |
 | Charles Darwin - Beagle Expedition - 1871 - 546 pages
...the action of the inclined surface of its body on the atmosphere may counterbalance its gravity. Tho force to keep up the momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Charles Darwin - Beagle Expedition - 1873 - 552 pages
...action of the inclined surface of its body on the atmosphere may counlerbalance its gravity. Thn f,iroe to keep up the momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Charles Darwin - Beagle Expedition - 1889 - 628 pages
...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...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Charles Darwin - Beagle Expedition - 1889 - 462 pages
...the action of the inclined * London's Magazine of Nat. Hist., vol. vii. 1834.] TRACES OF INDIANS. 135 surface of its body on the atmosphere may counter-balance...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Charles Darwin, R. T. Pritchett - Beagle Expedition - 1890 - 606 pages
...bird soaring, its motion must be 1 Loudon's Magazine of Nat. Hist. vol. vii. ix TRACES OF INDIANS 197 sufficiently rapid, so that the action of the inclined...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted.... | |
 | Biology - 1891 - 604 pages
...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...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted..... | |
 | Aeronautics - 1894 - 642 pages
...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...momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted?... | |
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