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ENGLISH 波多野结衣出道番號The variation of dimensions which are sensible to the touch at one ten-thousandth part of an inch, furnishes an example of how important the human senses are even after the utmost precision attainable by machine action. Pieces may pass beneath the cutters of a milling machine under conditions, which so far as machinery avails will produce uniform sizes, yet there is no assurance of the result until the work is felt by gauges.CHAPTER XXXIII. SHAPING MACHINES.
The excellent man went on weeping, and I was not able to console him and did not know what to say. He took my arm, and led me to the large common hall, where twenty wounded Germans lay, who had been hit in the fight for the forts. He went to one bed after the other, and, with tears in his eyes, asked each man how he felt, and inquired, "Are you ... properly ... cared for ... here? Are you?" The sick men turned round, their eyes beamed, and they stammered words full of gratitude. Others said nothing, but took the Head's hand and pressed it long and warmly.A finisher's engine lathe consists essentially of a strong inflexible shear or frame, a running spindle with from eight to sixteen changes of motion, a sliding head, or tail stock, and a sliding carriage to hold and move the tools.
In metal working, owing to a more perfect division of labour, and a more intelligent manipulation than in wood-working, there is less combination in machinesin fact, a combination machine for metal work is rarely seen at this day, and never under circumstances where it occasions actual loss. The advantage of combination, as said, can only be in the framing and floor space occupied by the machines, but these considerations, to be estimated by a proper standard, are quite insignificant when compared with other items in the cost of machine operating, such as the attendance, interest on the invested cost of the machine, depreciation of value by wear, repairing, and so on.The wind seemed to play with the smoke, rolling dense volumes down the slopes which dispersed only when they reached the bank along the river. Whilst the flames soared high up from the roofs, the walls of the houses stood still erect, and everywhere in the windows one saw those miserable little white flags, symbols of submission, mute prayers75 that submission should be rewarded by sparing the life and possession of the inhabitants....
Referring again to the hammer problem, it will be found by examining the history that the makers of automatic-acting steam-hammers capable of giving the dead stamp blow, have employed the principle which has been described. Instead of employing the momentum, or the gravity of moving parts, to open the valve after the hammer stops, some engineers have depended upon disengaging valve gear by the concussion and jar of the blow, so that the valve gearing, or a portion of it, fell and opened the valve. The 'dead blow gear,' fitted to the earlier Nasmyth, or Wilson, hammers, was constructed on the latter plan, the valve spindle when disengaged being moved by a spring.Netherland soldiers and inhabitants of the village bustled about along the opposite river-bank. I shouted as loudly as possible; and when at last I succeeded in drawing their attention, I made them understand that I wanted to be pulled across in the little boat, which in ordinary times served as a ferry. A short consultation took place now on the opposite side, after which a soldier, who clearly possessed a strong voice, came as near as possible to the waterside and, making a trumpet of his two hands, roared:No one has been able to explain clearly why a sudden change of temperature hardens steel, nor why it assumes various shades of colour at different degrees of hardness; we only know the fact, and that steel fortunately has such properties.
I said it quite innocently, without any other desire beyond that of taking off the edge of my really trying hunger. But the effect of my question was surprising indeed. He looked at me dumbfounded, and asked:In metal working, owing to a more perfect division of labour, and a more intelligent manipulation than in wood-working, there is less combination in machinesin fact, a combination machine for metal work is rarely seen at this day, and never under circumstances where it occasions actual loss. The advantage of combination, as said, can only be in the framing and floor space occupied by the machines, but these considerations, to be estimated by a proper standard, are quite insignificant when compared with other items in the cost of machine operating, such as the attendance, interest on the invested cost of the machine, depreciation of value by wear, repairing, and so on.Other soldiers kept on running into the burning houses, carrying out vases, pictures, plate, or small pieces of furniture. They smashed everything on81 the cobbles and then returned to wreck more things that would have been destroyed by the fire all the same. It was a revelry of drunken vandalism. They seemed mad, and even risked being burned alive at this work of destruction. Most of the officers were also tipsy; not one of them was saluted by the soldiers.
"Oh, but, sir, Wolff confirmed these reports."A short distance beyond this little caf lies the large bridge across the Meuse. Before the Germans arrived it was partly destroyed by the Belgians, but so inadequately that obviously the enemy could repair it easily. Bombs were therefore fired regularly from Fort Pontisse at the bridge, and only an hour ago it had been hit, with the result that a big hole was made in the undamaged part. In the road also big holes were made by the exploding projectiles. Having passed underneath the viaduct of the bridge, I found myself opposite Vis on the sloping bank of the Meuse. Two boys had been commanded by the Germans to work the ferry-30boat for them, and after I had shown them my passport, they took me to the other side.
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Movements and strains may be called two of the leading conditions upon which designs for machines are based: movements determine general dimensions, and strains determine the proportions and sizes of particular parts. Movement and strain together determine the nature and area of bearings or bearing surfaces.
I will now proceed to review these conditions or principles in pattern-making and casting in a more detailed way, furnishing as far as possible reasons for different modes of constructing patterns, and the various plans of moulding and casting.
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