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Irregularity of cooling may be the result of unequal conducting power in different parts of a mould or cores, or it may be [98] from the varying dimensions of the castings, which contain heat as their thickness, and give it off in the same ratio. As a rule, the drag or bottom side of a casting cools first, especially if a mould rests on the ground, and there is not much sand between the castings and the earth; this is a common cause of unequal cooling, especially in large flat pieces. Air being a bad conductor of heat, and the sand usually thin on the cope or top side, the result is that the top of moulds remain quite hot, while at the bottom the earth, being a good conductor, carries off the heat and cools that side first, so that the iron 'sets' first on the bottom, afterwards cooling and contracting on the top, so that castings are warped and left with inherent strains. There was not a sound, not a bird, excepting on the fringe of the forest. As we penetrated further there soon was no undergrowth even on the dry soil, between the ever closer array of trees; the creepers hung very low, tangled with clinging parasites; and between the stilt-like and twining roots and the drooping boughs, the path, now impracticable, suddenly ended in face of the total silence and black shade that exhaled a strong smell of pepper, while not a leaf stirred. “I might rip them apart—but do you think robbers carry acids along to eat up emeralds if they think they are going to profit by taking them?” “But maybe Sandy might get into trouble,” urged Larry. “He’d fight to stop Jeff, and that man is in a dangerous mood if he’d do what he has done.” They had as yet found no one in all the throng to give them the least information as to their regiment, when Si spied a member of Co. Q walking deliberately back, holding the wrist of his shattered left hand in his right, with his fingers compressing the artery to restrain the flow of blood. "Purty good milker, is she?" inquired the Deacon with interest. "I was gladder than I kin tell you to git yore letter. You "And yet Dara is dead," I say. "And others are dead. How do I feel happy when I know this?" Chapter 10 "I agree with you there," said Reuben, "it's not wot life gives that's good, it's wot you t?ake out of it." He leaned suddenly forward and took her hand. "Yes," replied Holgrave; "and enough too, I think, for any reasonable man at one time." HoME人体一级高清图片搜索
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