The American Journal of Science and ArtsS. Converse, 1847 |
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Página 1
... equal magnetic intensity , had the same general form surrounding and enclosing the magnetic poles and those of max- imum cold ; and that , by the same formula , mutatis mutandis , we could calculate the temperature and the magnetic ...
... equal magnetic intensity , had the same general form surrounding and enclosing the magnetic poles and those of max- imum cold ; and that , by the same formula , mutatis mutandis , we could calculate the temperature and the magnetic ...
Página 5
... equal tendency to urge it to- ward D. In like manner , the components of the forces of r and s , which solicit the north end of the needle in the directions PC and PD , destroy each other . The same may Prof. W. A. Norton on Terrestrial ...
... equal tendency to urge it to- ward D. In like manner , the components of the forces of r and s , which solicit the north end of the needle in the directions PC and PD , destroy each other . The same may Prof. W. A. Norton on Terrestrial ...
Página 6
... equal distances to the north and south of P. The action of m situated to the south Fig . 3 . P of P , will be in the direction Pa perpendicular to mP , and that of n will have the direction Pb perpendicular to nP . The force Pa may be ...
... equal distances to the north and south of P. The action of m situated to the south Fig . 3 . P of P , will be in the direction Pa perpendicular to mP , and that of n will have the direction Pb perpendicular to nP . The force Pa may be ...
Página 7
... equal to Pa.cos aPC = Pa . sin mPR = Pa . q ' ( r , h , R ) ; R being the radius of the circle , which may be taken equal to the radius of the earth , and h the height Pp of the needle above the circle . We have therefore for the action ...
... equal to Pa.cos aPC = Pa . sin mPR = Pa . q ' ( r , h , R ) ; R being the radius of the circle , which may be taken equal to the radius of the earth , and h the height Pp of the needle above the circle . We have therefore for the action ...
Página 8
... equal to √d2 — l3 , and the above expression will become 2At . F ( 1 , √da —l1 ) , or 2At . F ' ( l ) . It follows therefore that the entire action of any isogeothermal line AB in the vertical direction upon a needle at P , may be ...
... equal to √d2 — l3 , and the above expression will become 2At . F ( 1 , √da —l1 ) , or 2At . F ' ( l ) . It follows therefore that the entire action of any isogeothermal line AB in the vertical direction upon a needle at P , may be ...
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Pasajes populares
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Página 448 - The full-grown condor measures, from the point of the beak to the end of the tail, from...
Página 152 - Descriptions of fossil shells of the collections of the Exploring Expedition under the command of Charles Wilkes, USN, obtained in Australia, from the lower layers of the coal formation in Illawarra, and from a deposit probably of nearly the same age at Harper's Hill, valley of the Hunter. (American journal of science and arts. New Haven, 1847. 8°. series 2, v. 4, p. 151-160.) OA 324. Fossils of the Exploring Expedition under the command of Charles Wilkes, USN: a fossil fish from Australia, and...
Página 248 - He lives with pleasure, and he dies with pain. I am aware that the doctrine assumed in the first line of the couplet in reference to the particular insect is denied by some naturalists ; and that the fact assumed in the last line, in reference to the lower animals, is denied by others. Whatever be the truth as to the first point, I have no more doubt than I have of my own existence...
Página 448 - Cordillera that bird builds its nest, and hatches its young in the months of April and May. Few animals have attained so universal a celebrity as the condor. That bird was known in Europe at a period when his native land was numbered among those fabulous regions which are regarded as the scenes of imaginary wonders. The most extravagant accounts of the condor were written and read, and general credence was granted to every story which travellers brought from the fairy land of gold and silver. It...
Página 447 - Coco." The light given out by a few of these fungi, in a dark room, was sufficient to read by. It proved to be quite a new species ; and since my return from Brazil, has been described by the Rev.
Página 126 - Yet the attempt to explain, by the Cuvierian principles, the facts of special homology on the hypothesis of the subserviency of the parts so determined to similar ends in different animals...
Página 149 - This is a useful compendium of all that description of information which is valuable to the modern gardener. It quotes largely from the best standard authors, journals. and transactions of societies; and the labours of the American editor have fitted it for the United States, by judicious additions and omissions.
Página 447 - One dark night, about the beginning of December, while passing along the streets of the Villa de Natividade, I observed some boys amusing themselves with some luminous object, which I at first supposed to be a kind of large fire-fly ; but on making inquiry, I found it to be a beautiful phosphorescent fungus, belonging to the genus Agaricus, and was told that it grew abundantly in the neighbourhood on the decaying leaves of a dwarf palm.
Página 18 - Siberian rhinoceros, had hinted, that ' the kind of food which the existing species of elephant prefers will not enable us to determine, or even to offer a probable conjecture, concerning that of the extinct species. No one,' he said, ' acquainted with the gramineous character of the food of our fallow-deer, stag, or roe, would have assigned a lichen to the reindeer.