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It retains only the events or systems of events that can be thus isolated without being made to undergo too profound a deformation, because only these lend themselves to the application of its method. Our physics dates from the day when it was known how to isolate such systems.
It will be seen that these zones correspond to the zones of greatest sliding in the deformation of a bar forged with a sharp edged hammer, showing in fact that it is the mechanical work done in this sliding which is afterward transformed into heat.
On the other hand, mountain crests are usually divides, parting the head waters of different drainage systems. In these cases the original streams of the region have been broken or destroyed by the uplift of the mountain mass across their paths. On the whole, which have worked more rapidly, processes of deformation or of denudation?
Cracks and fissures, some opening and others closing, and the gradual deformation of the arches in the transept walls and elsewhere, indicated that fearful movements were taking place throughout the parts of the wall connected with the western piers." On Sunday, February 17th,
A similar deformation, with more pronounced flattening and backward pressure of the forehead, is shown on the crania which Jagor produced from a cave at Caramuan in Luzon. There are modes of flattening which remind one of Peru. When they came into our hands it was indeed an immense surprise, since no knowledge of such deformation in the South Sea was at hand.
The second kind of reactions are of a different nature. They continue to act when the deformation remains stationary, and, if the external forces happen to disappear, they are capable of causing the body to return to its initial form, provided a certain limit has not been exceeded. These last constitute rigidity.
'Mrs. Warwick says of you, that you're a bundle of straws for everybody and bread for nobody. Or, stranger speculation, through what, and what number of conduits, curious, and variously colouring, did it reach the fair Amabel of the infant-in-cradle smile, in that deformation of the original utterance!
In the course of M. Tresca's own experiments, however, he has found it necessary to consider, at the end of the period of alteration of elasticity, a third state, geometrically defined and describable as a period of fluidity, corresponding to the possibility of a continuous deformation under the constant action of the same strain.
Under slow but resistless pressure the strata of the Appalachian trough were thrust against the rigid land, and slowly, steadily bent into long folds whose axes ran northeast-southwest parallel to the ancient coast line. It was on the eastern side next the buttress of the land that the deformation was the greatest, and the folds most steep and close.
Immense bodies of molten rock were intruded into the crust as it suffered deformation, and these appear in the large areas of granite which the later denudation of the range has brought to light. The same movements probably uplifted the rocks of the Coast Range in a chain of islands. The whole western part of the continent was raised and its seas and lakes were for the most part drained away.
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