ONE:
TWO:Inherent 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.I had a fortune teller read the cards for me, Jeff told him. The nine o spadesthe worst card of warning in the packwas right over me and that means troubleand the ace of spades, a bad card
THREE:The safety, simplicity, and reliable action of hydraulic machinery has already led to its extensive employment for moving and lifting weights, and it is fair to assume that the importance and success of this invention fully entitle it to be classed as one of the most important that has been made in mechanical engineering during fifty years past. The application of hydraulic force in operating the machinery used in the processes for steel Bessemer manufacture, is one of the best examples to illustrate the advantages and principles of the hydraulic system. Published drawings and descriptions of Bessemer steel plant explain this hydraulic machinery.Two philosophers only can be named who, in modern times, have rivalled or approached the moral dignity of Socrates. Like him, Spinoza realised his own ideal of a good and happy life. Like him, Giordano Bruno, without a hope of future recompense, chose death rather than a life unfaithful to the highest truth, and death, too, under its most terrible form, not the painless extinction by hemlock inflicted in a heathen city, but the agonising dissolution intended by Catholic love to serve as a foretaste of everlasting fire. Yet with neither can the parallel be extended further; for Spinoza, wisely perhaps, refused to face the storms which a public profession and propagation of his doctrine would have raised; and the wayward career of Giordano Bruno was not in keeping with its heroic end. The complex and distracting conditions in which their lot was cast did not permit them to attain that statuesque completeness which marked the classic age of Greek life and thought. Those times developed a wilder energy, a more stubborn endurance, a sweeter purity than any that the ancient world had known. But until the scattered elements are recombined in a still loftier harmony, our sleepless thirst for perfection can be satisfied at one spring alone. Pericles must remain the ideal of statesmanship, Pheidias of artistic production, and Socrates of philosophic power.
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