ENGLISH “乳腺开发诊所 JULIA”By what accident had I not been disturbed? The height, perhaps, at which my miserable little garret-room was situated.
And supposing for a moment that the allegations made by the Germans were true, that there had been shooting at Visé for example, then one might perhaps consider the revenge justifiable, but should also expect that they would punish with a heavy heart, conscious that they were inflicting a necessary evil."Is this then the road to Visé?"
Some makers of steam-hammers have so perfected the automatic class, that they may be instantly changed so as to work with either dead blows or elastic blows at pleasure, thereby combining all the advantages of both principles. This brings the steam-hammer where it is hard to imagine a want of farther improvement.CHAPTER XIII. GEARING AS A MEANS OF TRANSMITTING POWER.Even a doctor of the Red Cross established at St. Hadelin College had been removed in his white overall and wearing his Red Cross armlet. This was Dr. Labye, who already had rendered signal services to the wounded Germans. In consequence of his detention twenty of them were left in the hospital without medical attendance....
A proof of this last proposition is found in the fact that a thorough latheman will perform nearly as much work and do it as well on an old English lathe with plain screw feed, as can be performed on the more complicated lathes of modern construction; but as economy of skill is sometimes an equal or greater object than a saving of manual labour, estimates of tool capacity should be made accordingly. The main points of a lathe, such as may most readily affect its performance, are first—truth in the bearings of the running spindle which communicates a duplicate of its shape to pieces that are turned,—second, coincidence between the line of the spindle and the movement of the carriage,—third, a cross feed of the tool at a true right angle to the spindle and carriage movement,—fourth, durability of wearing surfaces, especially the spindle bearings and sliding ways. To these may be added many other points, such as the truth of feeding screws, rigidity of frames, and so on, but such requirements are obvious.
CHAPTER XIThe men stopped their horses, dismounted, and returned the fire from behind their animals. This went on for about a quarter of an hour. Every one was alarmed by this shooting; other soldiers came racing in from the station, and others ran to and fro near that building crying, "A surprise attack!" Some, thinking that the attack came from the advancing Belgians, rushed to the place where the fighting took place, others misunderstood the cry, believed that the citizens assaulted them, and began to shoot at these, and at the houses."To the inhabitants of the City of Louvain
The adaptation, endurance, and cost of machines in designing become resolved into problems of movements, the arrangement of parts, and proportions.45 All the forts thundered away again, and the guns of the Germans were also busy on the citadel and the various surrounding heights. Already early in the morning a terrible and suffocating smoke of fire and gunpowder hovered over Liège. The smoke came down also from the burning villages, like Bressoux, on the slopes of the hills near Liège. The flames flared up from the houses and offered a melancholy sight.
3. Two elevations taken at right angles to each other, fix all points, and give all dimensions of parts that have their axis parallel to the planes on which the views are taken; but when a machine is complex, or when several parts lie in the same plane, three and sometimes four views are required to display all the parts in a comprehensive manner.Some uphold the accusation on the ground of expressions in Belgian newspapers, collected in a German pamphlet. In my opinion these quotations have not the slightest value. Everyone will understand this who thinks of the excitement of journalists, whose country was suddenly and quite unexpectedly involved in a terrible war, and who felt now that as journalists they had to perform a great, patriotic duty. In their nervous, over-excited condition they sat at their desk and listened to the gossip of refugees about civilians taking part in the struggle. In their imagination they saw hordes of barbarians overrun their native soil, saw man and man, woman88 and woman, shoulder to shoulder, resisting the invader without regard for their own life. The thoughts of such journalists, whose very own country had been at war now for a few days, were not on severe logical lines; they found a certain beauty in that picture, and I can quite understand how some came to believe in it as a reality, and gloried in it.
(1.) If milling tools operate faster than planing or turning tools, why are they not more employed?—(2.) How may the effect produced by cutting tools generally be computed?—(3.) To what class of work are milling machines especially suited?—(4.) Why do milling processes produce more accurate dimensions than are attainable by turning or planing?—(5.) Why can some branches of manufacture be said to depend on milling processes?32
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It may be remarked as a general rule that the hardness of cutting tools is "inverse as the hardness of the material to be cut," which seems anomalous, and no doubt is so, if nothing but the cutting properties of edges is considered; but all cutting edges are subjected to transverse strain, and the amount of this strain is generally as the hardness of the material acted upon; hence the degree of temper has of necessity to be such as to guard against breaking the edges. Tools for cutting wood, for example, can be much harder than for cutting iron, or to state it better, tools for cutting wood are harder than those usually employed for cutting iron; for if iron tools were always as carefully formed and as carefully used as those employed in cutting wood, they could be equally hard.The majority of the refugees returning to Louvain belonged to the lower classes, and they began to loot and plunder the town, encouraged thereto by the German soldiers, who threw the things into the streets, and said: "Take it, if you like!" In extenuation of the looting and plundering I might say that the poor wretches tried before all to get hold of half-burned eatables.Different kinds of gearing can be seen in almost every engineering establishment, and in view of the amount of scientific information available, it will only be necessary to point out some of the conditions that govern the use and operation of the different kinds of wheels. The durability of gearing, aside from breaking, is dependent upon pressure and the amount of rubbing action that takes place between the teeth when in contact. Spur wheels, or bevel wheels, when the pitch is accurate and the teeth of the proper form, if kept clean and lubricated, wear but little, because the contact between the teeth is that of rolling instead of sliding. In many cases, one wheel of a pair is filled with wooden cogs; in this arrangement there are four objects, to avoid noise, to attain a degree of elasticity in the teeth, to retain lubricants by absorption in the wood, and to secure by wear a better configuration of the teeth than is usually attained in casting, or even in cutting teeth.
I had a short chat with the wounded men near the various houses, on demand showed my passport to those in authority, and was advised as a friendly Netherlander to return, as it was extremely dangerous on the road. But I did not dream of doing34 this, as long as I was not compelled, and went on towards Liège amidst this maddening thunder.A learner will no doubt wonder why sand is used for moulding, instead of some more adhesive material like clay. If he is not too fastidious for the experiment, and will apply a lump of damp moulding sand to his mouth and blow his breath through the mass, the query will be solved. If it were not for the porous nature of sand-moulds they would be blown to pieces as soon as the hot metal entered them; not only because of the mechanical expansion of the gas, but often from explosion by combustion. Gas jets from moulds, as may be seen at any time when castings are poured, will take fire and burn the same as illuminating gas."How much is it, madame?"详情
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