2021-04-17 09:58:12

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ENGLISH The officer went on shaking his head at my answers, and I felt as if this might be the end of my fine little adventure. But I could not tell him that I had gone to Lige with that permit for Vis!

"Have you been there already? I am going there too. How are things there?"These conditions of short range and great force are best attained by what may be termed percussion, and by machines which act by blows instead of positive and gradual pressure; hence we find that hand and power hammers are the most common tools among those of the smith-shop.I will, in connection with this subject of patterns and castings, suggest a plan of learning especially applicable in such cases, that of adopting a habit of imagining the manner of moulding, and the kind of pattern used in producing each casting that comes under notice. Such a habit becomes easy and natural in a short time, and is a sure means of acquiring an extended knowledge of patterns and moulding.

The life of George Stephenson proves that notwithstanding the novelty and great importance of his improvements in steam transit, he did not "discover" these improvements. He did not discover that a floating embankment would carry a railway across Chat Moss, neither did he discover that the friction between the wheels of a locomotive and the rails would enable a train to be drawn by tractive power alone. Everything connected with his novel history shows that all of his improvements were founded upon a method of reasoning from principles and generally inductively. To say that he "discovered" our railway system, according to the ordinary construction of the term, would be to detract from his hard and well-earned reputation, and place him among a class of fortunate schemers, who can claim no place in the history of legitimate engineering.A solid milling cutter must be an accurately finished piece of work, made with more precision than can be expected in the work it is to perform. This accuracy cannot be attained by ordinary processes, because such tools, when tempered, are liable to become distorted in shape, and frequently break. When hardened they must be finished by grinding processes, if intended for any accurate work; in fact, no tools, except gauging implements, involve more expense to prepare, and none are so liable to accident when in use.Farther on in the Rue de la Station lay nine rotting carcases of horses, the intestines oozing from the bodies, and a greasy substance was poured over their skin. The stench was unbearable and made breathing nearly impossible, which compelled me to jump on my bicycle and escape as quickly as possible from the pestilential surroundings.

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Although I had been commanded to return "at once" to Maastricht, I succeeded in having a chat here and there with the inhabitants of Riemst. I had visited the village about eight days ago, but what a change! Then the people assured me that "die Duutschen"[2] were not so bad after all, that they were compelled to do their duty, and were kind to the inhabitants if these were kind to them.When a tool is guided by turning on points, the movement is perfect, and the straightness or parallelism of holes bored in this manner is dependent only on the truth of the carriage movement. This plan of boring is employed for small steam cylinders, cylindrical valve seats, and in cases where accuracy is essential.

In the case of line shafting for manufactories, if the speed varies so much from that of the first movers on machines as to require one or more intermediate or countershafts, the expense would be very great; on the contrary, if countershafts can be avoided, there is a great saving of belts, bearings, machinery, and obstruction. The practical limit of speed for line shafts is in a great measure dependent upon the nature of the bearings, a subject that will be treated of in another place.When I got to the house everything was in a frightful state. A pair of curtains showed traces of fire; cupboards had been emptied, and nearly all the china and glass broken; statuary lay broken on the floor; windows were smashed; bits of bricks and plaster from the ceilings, through which many shots had been fired, completed the scene of destruction. On the doorstep I picked up a cartridge-case, which I have always kept, because it is highly probable that it had contained the bullet which killed Mrs. Poswick.

CHAPTER XII. BELTS FOR TRANSMITTING POWER.

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CHAPTER XXXVIII. GAUGING IMPLEMENTS.I was greatly astonished to see a little old man sitting by his house, while all those in the neighbour118hood were burning. His own dwelling had escaped without much damage, and was only hit by rifle bullets. He told me that his family had fled, his son with wife and all children but one, a small boy. At length he left also, but had lost his way outside the town, and returned to his house, where the Germans "allowed" him to remain. I considered that I might after all sleep better in that house than yonder among the soldiers, and asked the little man whether he would put me up for the night. He did not object at all; but in spite of my pressing, he refused absolutely to accept any payment.

To the unskilled, or to those who do not take a comprehensive view of an engineering business as a whole, the finishing and fitting department seems to constitute the whole of machine manufacturean impression which a learner should guard against, because nothing but a true understanding of the importance and relations of the different divisions of an establishment can enable them to be thoroughly or easily learned.The duplicate system has gradually made its way in locomotive engineering, and will no doubt extend to the whole of [150] railway equipment, as constants for dimensions are proved and agreed upon.32

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Apr-17 09:58:12