There were three kinds of strain mentionedtorsional, deflective, and accidental. To meet these several strains the same means have to be provided, which is a sufficient size and strength to resist them; hence it is useless to consider each of these different strains separately. If we know which of the three is greatest, and provide for that, the rest, of course, may be disregarded. This, in practice, is found to be accidental strains to which shafts are in ordinary use subjected, and they are usually made, in point of strength, far in excess of any standard that would be fixed by either torsional or transverse strain due to the regular duty performed.By assuming this or any other well-proved example, and estimating larger or smaller shafts by keeping their diameters as the cube root of the power to be transmitted, the distance between bearings as the diameter, and the speed inverse as the diameter, the reader will find his calculations to agree approximately with the modern practice of our best engineers. This is not mentioned to give proportions for shafts, so much as to call attention to accidental strains, such as winding belts, and to call attention to a marked discrepancy between actual practice and such proportions as would be given by what has been called the measured or determinable strains to which shafts are subjected.Very slowly the huge monster sauntered along, stopping and waiting everywhere to allow long trains with fresh troops to pass. These came straight from Germany, with the youngest levies and volunteers who had just finished their drill. These had decorated their trains all over with green boughs and outside painted all sorts of caricatures, from which especially King George had to suffer much. Then one read "To Paris, to England," and similar hopeful devices.
ONE:"You wished to speak to me," said Gordon. "Pray sit down."
TWO:"I want you to read them and act upon them," he said. "You'll have to put that Corner House business out of your head for a day or two at any rate. It appears that a gang of cosmopolitan swindlers have established their headquarters somewhere in Soho, and by means of using several addresses they are getting a tremendous quantity of goods which they proceed to turn into money. Here is one of their advertisements cut from the Standard. You had better answer it, and get in touch with the fellows that way. But nobody can manage that sort of thing better than you.""Look at the bottom of those saucepans," said Lawrence. "See how they are smoked; at the same time there is no soot on them. Our quarry has not dared to light a fire by reason of the smoke. It is quite plain that Hetty was not mistaken when she said she saw a hand holding a kettle over the gas. And, by Jove, this kettle is warm still!"
FORE:
THREE:The little man's language burst out furiously. Nothing less than war between France and England should wipe out this insult to the tricolor. Prout had burst open a desk and was examining the papers there as tranquilly as if he were stone deaf. He came across something presently that caused his eyes to gleam and his heart to beat with a feeling of triumph.The passionate despair of the tones touched Ren. It did not seem possible to the man that this woman was acting.
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THREE: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.I guess I better explain, Jeff decided. I didnt think you was so suspicious and quick or Id of done different.
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THREE:Upon entering a shop the first thing to be done is to gain the confidence and the respect of the manager or foreman who has charge of the work; to gain such confidence and respect is different from, and has nothing to do with, social relations and must depend wholly upon what transpires in the works. To inspire the confidence of a friend one must be kind, faithful, and honourable; but to command the confidence of a foreman one must be punctual, diligent, and intelligent. There are no more kindly sentiments than those which may be founded on a regard for industry and earnest effort. A learner may have the misfortune to break tools, spoil work, and fail in every [167] way to satisfy himself, yet if he is punctual, diligent, and manifests an interest in the work, his misfortunes will not cause unkind resentment.
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THREE:The reader, in order to better understand what is said, may keep in mind a common shaping machine with crank motion, a machine which nearly fills the requirements for cutting tooth racks.
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THREE:When I arrived in Louvain I heard of a young Fleming who was then being nursed in a hospital established by the Norbertine Fathers, and had been serving at two pieces of ordnance near Corbeek-Loo. As the army was forced to retreat in the evening his comrades were compelled to abandon the two guns, but he had to stay, being wounded in the leg by a grape shot. The Germans made him prisoner, and tied him to a tree. By an immense effort he succeeded in tearing himself loose, and dragged himself towards a farm-house. At a short distance from this goal he was stopped, however, by a German soldier. The Fleming, putting forth all his remaining strength, gave the other such a tremendous blow in the face with his rifle-butt that he fell down dead. Subsequently this boy reached the farm-house, where he was charitably received. Later on he was fetched away by the Sisters from Boven-Loo, and finally from that institution by the Norbertine Fathers.(1.) Name the different departments of an engineering establishment.(2.) What does the engineering establishment include?(3.) What does the commercial department include?(4.) The foundry department?(5.) The forging department?(6.) The fitting department?(7.) What does the term shop system mean as generally employed?
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THREE:These are but a few of many influences which tend to irregular cooling, and are described with a view of giving a clue from which other causes may be traced out. The want of uniformity in sections which tends to irregular cooling can often be avoided without much loss by a disposition of the metal with reference to cooling strains. This, so far as the extra metal required to give uniformity to or to balance the different sides of a casting, is a waste which engineers are sometimes loth to consent to, and often neglect in designs for moulded parts; yet, as before said, the difficulty of irregular cooling can in a great degree be counteracted by a proper distribution of the metal, without wasting, if the matter is properly understood. No one is prepared to make designs for castings who has not studied the subject of cooling strains as thoroughly as possible, from practical examples as well as by theoretical deductions.
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THREE:The 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.
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THREE:
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THREE:
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Trip Status
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Trip Pricing & Plans
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FORE:Sheer astonishment got the better of Leona Lalage's rage. That Hetty above all people should turn upon her like this was amazing. She looked again at the clock, which pointed to four minutes to twelve.Not exactly. But it came over me that at night I didnt get anywhere and I thought Id try coming in the daytimeand being that the yacht is due to make Long Island this afternoon, I thought I might need some help with a plan Ive worked out.
FORE:In the water, spilled by our wash, he decided.Ink used in drawing should always be the best that can be procured; without good ink a draughtsman is continually annoyed by an imperfect working of pens, and the washing of the lines if there is shading to be done. The quality of ink can only be determined by experiment; the perfume that it contains, or tinfoil wrappers and Chinese labels, are no indication of quality; not even the price, unless it be with some first-class house. To prepare ink, I can recommend no better plan of learning than to ask some one who understands the matter. It is better to waste a little time in preparing it slowly than to be at a continual trouble with pens, which will occur if the ink is ground too rapidly or on a rough surface. To test ink, a few lines can be drawn on the margin of a sheet, noting the shade, how the ink flows from the pen, and whether the lines are sharp; after the lines have dried, cross them with a wet brush; if they wash readily, the ink is too soft; if they resist the water for a time, and then wash tardily, the ink is good. It cannot be expected that inks soluble in water can permanently resist its action after drying; [83] in fact, it is not desirable that drawing inks should do so, for in shading, outlines should be blended into the tints where the latter are deep, and this can only be effected by washing.
FORE:Milling relates to metal cutting with serrated rotary cutters, and differs in many respects from either planing or turning. The movement of the cutting edges can be more rapid than with tools which act continuously, because the edges are cooled during the intervals between each cut; that is, if a milling tool has twenty teeth, any single tooth or edge acts only from a fifteenth to a twentieth part of the time; and as the cutting distance or time of cutting is rarely long enough to generate much heat, the speed of such tools may be one-half greater than for turning, drilling, or planing tools. Another distinction between milling and other tools is the perfect and rigid manner in which the cutting edges are supported; they are short and blunt, besides being usually carried on short rigid mandrils. A result of this rigid support of the tools is seen in the length of the cutting edges that can be employed, which are sometimes four inches or more in length. It is true the amount of material cut away in milling is much less than the edge movement will indicate when compared with turning or planing; yet the displacing capacity of a milling machine exceeds that of either a lathe or a planing machine. Theoretically the cutting or displacing capacity of any metal or wood cutting machine, is as the length of the edges multiplied into the speed of their cutting movement; a rule which applies very uniformly in wood cutting, and also in metal cutting within certain limits; but the strains that arise in metal cutting are so great that they may exceed all means of resisting them either in the material acted upon, or in the means of supporting tools, so that the length of cutting edges is limited. In turning chilled rolls at Pittsburg, [141] tools to six inches wide are employed, and the effect produced is as the length of the edge; but the depth of the cut is slight, and the operation is only possible because of the extreme rigidity of the pieces turned, and the tools being supported without movable joints as in common lathes.I was soon fast asleep, tired out by my bicycle ride of that day of about forty-five miles, and my wanderings through Lige. But my rest was not to be a long one. At about ten o'clock I was awakened by a great noise on the stairs, and was surprised to see six armed soldiers in my room. That is not exactly a pleasant manner of waking up after so short a sleep. They informed me in a gruff voice that I had to get up, to dress and follow them. As I obeyed the order, I asked what gave me this unexpected honour; but they refused to enlighten me on that point.
GALLERY
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FORE:"Never lose your temper," he said. "It leads to apoplexy. Ah, my fine madam, you thought to pinch me, but I have pinched you instead."
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FORE:
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FORE:"Not at all! If you step outside, you can see them standing, ten minutes from here. Near Lixhe they threw a bridge across the Meuse. It is the third already which they put down, for each time they are smashed from the fort. Oh, it is horrible; there must surely fall a number of dead, and here we have seen corpses in the Meuse already.... But I do not understand how you ventured to come here...."
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A number of the men were taken to Germany, the others were kept as prisoners in the neighbourhood, and by and by had to suffer the shame of being74 compelled to work for the enemy. Amongst them were men who had never done any manual work, such as an aged notary public.Hetty nodded absently; in society parlance Lady Longmere had taken Hetty up. Since the night of the card party at Lytton Avenue, when her ladyship had foresworn cards for good and all, she had seen a good deal of Hetty. And she was one of the few who stuck loyally to Bruce.Ren had opened the tin with the point of his knife, and was eating sardines and biscuits in a wolfish way. The Chianti he drank from the bottle.
