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The steam-engine, in the sense in which the term is employed, means not only steam-using machinery, but steam-generating machinery or plant; it includes the engine proper, with the boiler, mechanism for feeding water to the boiler, machinery for governing speed, indicators, and other details.We find the same theory reproduced and enforced with weighty illustrations by the great historian of that age. It is not known whether Thucydides owed any part of his culture to Protagoras, but the introduction to his history breathes the same spirit as the observations which we have just transcribed. He, too, characterises antiquity as a scene of barbarism, isolation, and lawless violence, particularly remarking that piracy was not then counted a dishonourable profession. He points to the tribes outside Greece, together with the most backward among the Greeks themselves, as representing the low condition from which Athens and her sister states had only emerged within a comparatively recent period. And in the funeral oration which he puts into the mouth of Pericles, the legendary glories of Athens are passed over without the slightest allusion,69 while exclusive prominence is given to her proud position as the intellectual centre of Greece. Evidently a radical change had taken place in men��s conceptions since Herodotus wrote. They were learning to despise the mythical glories of their ancestors, to exalt the present at the expense of the past, to fix their attention exclusively on immediate human interests, and, possibly, to anticipate the coming of a loftier civilisation than had as yet been seen.

ONE:By examining into the facts, an apprentice will find that all truly successful establishments have been founded and built upon the mechanical abilities of some person or persons whose skill formed a base upon which the business was reared, and that true skill is the element which must in the end lead to permanent success. The material and the labour which make up the first cost of machines are, taking an average of various classes, nearly equally divided; labour being in excess for the finer class of machinery, and the material in excess for the coarser kinds of work. The material is presumed to be purchased at the same rates by those of inferior skill as by those that are well skilled, so that the difference in the first, or manufacturing cost of machinery, is determined mainly by skill.

THREE:To avoid imperfection in the running spindles of lathes, or any lateral movement which might exist in the running bearings, there have been many attempts to construct lathes with still centres at both ends for the more accurate kinds of work. Such an arrangement would produce a true cylindrical rotation, but must at the same time involve mechanical complication to outweigh the object gained. It has besides been proved by practice that good fitting and good material for the bearings and spindles of lathes will insure all the accuracy which ordinary work demands.

FORE:75Milling 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.

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FORE:

FORE:I RETURNED from Louvain by military train. This one had had a most adventurous journey before it reached Louvain. It had left Cambrai in North France three days before, always going slowly and making long stops, to spare the seriously wounded at least a little. I estimated that in my train over 2,000 wounded had been loaded in a long, dismal procession of wagons. Most of them had not had their bandages renewed for a fortnight, and were still wearing the first emergency dressing; all came from the neighbourhood of Arras."If I come again can you refresh your memory?"

THREE:In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstances��the hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.

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THREE:"If I was only out of the house," she said. "If I was only out of that house."
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FORE:She paused as some one entered the box. A slight dark man, almost a half caste, with black hair and glasses. He was immaculately dressed; his style was quiet, with a touch of humility about it.

Founder

FORE:Not half of the requisitioned meat was used by the Germans, and the rest was simply left to rot, whilst the starving people were not allowed to touch it. Two pigs and a cow were shot in a meadow, but no part of these animals had been used, the order to bury them being given when the smell became unendurable. In some places the Germans indulged in such unspeakably filthy acts, that it is impossible to mention details.The seaplane wavered, caught itself in a steadier line. In the pursuing airplane three youthful faces grew intent.

Senior Desigener

FORE:First. Gravity wheels, acting directly from the weight of the water which is loaded upon a wheel revolving in a vertical plane, the weight resting upon the descending side until the water has reached the lowest point, where it is discharged."I wonder who Herr Max Kronin is?" he muttered. "Ask the gentleman in."

Lead Developer

FORE: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.10

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THREE:82

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THREE:"Bah, you grow old, you get senile," Balmayne said contemptuously. "You have had an experience tonight that should be a warning to you. Now put it to yourself. We try to rob you--you, above all men in the world, who hold us in the hollow of your hands. Surely you pay us a very poor compliment! Our cue is to conciliate you, to find other victims to pay what we owe you and keep you silent. Once you are satisfied you will never tell--you will enjoy the sport of seeing others bitten too well. But you keep a carriage in the future and have no more fits in the street."

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FORE:CHAPTER VI. CHARACTERISTICS OF ARISTOTLE.Another form of naturalistic religion, fitted for universal acceptance by its appeals to common experience, was the worship of the Sun. It was probably as such that Mithras, a Syro-Persian deity, obtained a success throughout the Roman empire which at one time seemed to balance the rising fortunes of Christianity. Adoration of the heavenly bodies was, indeed, very common during this period, and was probably connected with the extreme prevalence of astrological superstition. It would also harmonise perfectly with the still surviving Olympian religion of the old Hellenic aristocracy, and would profit by the support which philosophy since the time of Socrates had extended to this form of supernaturalist belief. But, perhaps, for that very reason the classes which had now216 become the ultimate arbiters of opinion, felt less sympathy with Mithras-worship and other kindred cults than with the Egyptian mysteries. These had a more recognisable bearing on their own daily life, and, like the Chthonian religions of old Greece, they included a reference to the immortality of the soul. Moreover, the climate of Europe, especially of western Europe, does not permit the sun to become an object of such excessive adoration as in southern Asia. Mithras-worship, then, is an example of the expansive force exhibited by Oriental ideas rather than of a faith which really satisfied the wants of the Roman world.