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A learner who goes from gearing and shafts to steam and hydraulics, from machine tools to cranes and hoisting machinery, will not accomplish much. The best way is to select at first an easy subject, one that admits of a great range of modification, and if possible, one that has not assumed a standard form of construction. Bearings and supports for shafts and spindles, [158] is a good subject to begin with.
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After touring quite a long while through this labyrinth, we got at last back to the main road from Namur to Dinant, near Anhec. Here immediately we saw proofs of war, drawn from widespread destruction. The railway bridge across the Meuse near Houx, so picturesquely situated at the foot of a high rock, had been blown up."Ah, there comes Mister Tijd, and heInherent or cooling strains in castings is much more intricate than shrinkage: it is, in fact, one of the most uncertain and obscure matters that pattern-makers and moulders have to contend with. Inherent strains may weaken castings, or cause them to break while cooling, or sometimes even after they are finished; and in many kinds of works such strains must be carefully guarded against, both in the preparation of designs and the arrangement of patterns, especially for wheels and pulleys with spokes, and for struts or braces with both ends fixed. The main difficulty resulting from cooling strains, however, is that of castings being warped and sprung; this difficulty is continually present in the foundry and machine-shop, and there is perhaps no problem in the whole range of mechanical manipulation of which there exists more diversity of opinion and practice than of means to prevent the springing of castings. This being the case, an apprentice can hardly hope for much information here. There is no doubt of springing and strains in castings being the result of constant causes that might be fully understood if it were not for the ever-changing conditions which exist in casting, both as to the form of pieces, the temperature and quality of metal, mode of cooling, and so on.97The town was on fire, and ruddy smoke hovered over it. Deserted like a wilderness, not a soul moved in the streets. The first street I entered was the Rue de la Station. Large, imposing mansions used to stand here, but the devouring fire consumed even the last traces of former greatness.I was roughly pushed back by the German soldiers twice over. I broke through only to be repulsed again. They got into difficulties with the huge crowd, who pushed through on all sides, bought up the stock of surrounding shops, and threw chocolates and other sweets, cigars and cigarettes, at their boys. Then a bugle sounded, and the Belgians once more were arrayed in files. They calmly lighted their cigarettes, and as the order "march" was given, they took off their caps, waved them through the air, and, turning to the Lige crowd, exclaimed: "Vive la Belgique." Then hundreds of caps, hats, and arms were waved in response, the air resounding the cry: "Vive la Belgique. Au revoir! Au revoir!"
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