American Journal of Science and Arts, Volume 108

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J.D. & E.S. Dana, 1874 - Science


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Page 117 - finding at any time the rate of variation of temperature from point to point, and the actual temperature at any point, in a solid extending to infinity in all directions, on the supposition that at an initial epoch the temperature has had two different constant values on the two sides of a certain infinite plane.
Page 360 - or 17 minutes. In the torrid zone of the new continent I have found the regularity of this ebb and flow of the aerial ocean undisturbed either by storm, tempest, rain, or earthquake, both on the coasts, and at elevations of nearly 13,000 English feet above the level of the • Phil. Trans., 1835, p. 167.
Page 308 - The hypotheses of Challis and Le Sage have one thing in common ; the motion of the ether and the driving storm of atoms must come from outside the world of stars. "On either theory, the universe is not even temporarily automatic, but must be fed from moment to moment by an agency
Page 76 - the outside casing of a silver watch was disposed of in one part of the pile, the glass of the same watch in another, and the works in still another; an old purse containing some silver, matches and tobacco ; nearly
Page 350 - putting F' for the resistance to motion at right angles to the radius, or in the direction of the gyratory motion. The other component of the resistance, therefore, contrary to the direction of the radius, in which the velocity of motion is D t r, is represented by
Page 288 - When neutral potassic chromate is added to a solution of nitrate of xanthocobalt, a beautiful yellow crystalline precipitate is thrown down, which may be washed with cold water, in which it is but slightly soluble. Hot water also dissolves this salt in very small quantity. The chromate has the formula Co
Page 306 - are of some interest in physics as illustrating the great question of the eighteenth and nineteenth centuries—Is action at a distance a reality, or is gravitation to be explained, as we now believe magnetic and electric forces must be, by action of intervening matter
Page 360 - tide."* Humboldt likewise observes with regard to the regularity of these oscillations in the torrid zone: ''This regularity is such that, in day time especially, we may infer the hour from the height of the column of mercury without being in error, on an average, more than
Page 218 - that the vegetable debris from which the coal has proceeded was largely bark, or material of that general nature. But the occurrence of such stumps and stems outside of the coal-beds, while proof that the interior wood of the plants was loose in texture and very easily decayed, is no evidence that these trees contributed only
Page 66 - which has been stretched in one direction, has a similar action on light. If a circular piece is cut out of such a stretched film and warmed, it contracts in the direction in which the stretching took place. The body of a sea-nettle has all the appearance of a transparent jelly, and

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