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Jeff, glancing back, caught Sandys nod.

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The most perfect castings for gear wheels and pulleys and other pieces which can be so moulded, are made by drawing the patterns through templates without rapping. These templates are simply plates of metal perforated so that the pattern can be forced through them by screws or levers, leaving the sand intact. Such templates are expensive to begin with, because of the accurate fitting that is required, especially around the teeth of wheels, and the mechanism that is required in drawing the patterns, but when a large number of pieces are to be made from one pattern, such as gear wheels and pulleys, the saving of labour will soon pay for the templates and machinery required, to say nothing of the saving of metal, which often amounts to ten per cent., and the increased value of the castings because of their accuracy.PREFACE.
ONE:V.
TWO:"Have they given you back everything?" 更多 »
TWO:In the driving gearing of planing machines, conditions which favour the reversing movement are high speed and narrow driving belts. The time in which belts may be shifted is as their speed and width; to be shifted a belt must be deflected or bent edgewise, and from this cause wind spirally in order to pass from one pulley to another. To bend or deflect a belt edgewise there will be required a force in proportion to its width, and [133] the time of passing from one pulley to another is as the number of revolutions made by the pulleys.
TWO:Were this intellectual despondency to issue in a permanent suspense of judgment, it would be bad enough; but practically its consequences are of a much more mischievous character. The human mind is so constituted that it must either go forward or fall back; in no case can it stand still. Accordingly, the lazy sceptic almost always ends by conforming to the established creeds and customs of his age or of the society in which he lives; thus strengthening the hands of authority in its conflict with the more energetic or courageous enquirers, whose object is to discover, by the unaided efforts of reason, some new and positive principle either of action or of belief. And the guardians of orthodoxy are so well aware of the profit to be reaped from this alliance that, when debarred from putting down their opponents by law or by public opinion, they anxiously foster false scepticism where it is already rampant, and endeavour to create it where it does not exist. Sometimes disinterested morality is the object of their attack, and at other times the foundations of inductive science. Their favourite formula is that whatever objections may be urged against their own doctrines, others equally strong may be urged against the results of free thought; whereas the truth is that such objections, being applicable to all systems alike, exactly balance one another, leaving the special arguments against irrationalism to tell with as much force as before. And they also lay great stress on the internal dissensions of their assailantsdissensions which only bring out into more vivid relief the one point on which all are agreed, that, whatever else may be true, the traditional opinions are demonstrably false.
TWO:The scepticism of Protagoras went beyond theology and extended to all science whatever. Such, at least, seems to have been the force of his celebrated declaration that man is the measure of all things, both as regards their existence and their non-existence.67 According to Plato, this doctrine followed from the identification of knowledge with sensible perception, which in its turn was based on a modified form of the Heracleitean theory of a perpetual flux. The series of external changes which constitutes Nature, acting on the series of internal changes which constitutes each mans personality, produces particular sensations, and these alone are the true reality. They vary with every variation in the88 factors, and therefore are not the same for separate individuals. Each mans perceptions are true for himself, but for himself alone. Plato easily shows that such a theory of truth is at variance with ordinary opinion, and that if all opinions are true, it must necessarily stand self-condemned. We may also observe that if nothing can be known but sensation, nothing can be known of its conditions. It would, however, be unfair to convict Protagoras of talking nonsense on the unsupported authority of the Theaettus. Plato himself suggests that a better case might have been made out for the incriminated doctrine could its author have been heard in self-defence. We may conjecture that Protagoras did not distinguish very accurately between existence, knowledge, and applicability to practice. If we assume, what there seems good reason to believe, that in the great controversy of Nature versus Law, Protagoras sided with the latter, his position will at once become clear. When the champions of Nature credited her with a stability and an authority greater than could be claimed for merely human arrangements, it was a judicious step to carry the war into their territory, and ask, on what foundation then does Nature herself stand? Is not she, too, perpetually changing, and do we not become acquainted with her entirely through our own feelings? Ought not those feelings to be taken as the ultimate standard in all questions of right and wrong? Individual opinion is a fact which must be reckoned with, but which can be changed by persuasion, not by appeals to something that we none of us know anything about. Man is the measure of all things, not the will of gods whose very existence is uncertain, nor yet a purely hypothetical state of Nature. Human interests must take precedence of every other consideration. Hector meant nothing else when he preferred the obvious dictates of patriotism to inferences drawn from the flight of birds.
TWO:In the manufacture of machines, there are usually so many sizes and modifications, that drawings should assist and determine in a large degree the completeness of classification and record. Taking the manufacture of machine tools, for example: we cannot well say, each time they are to be spoken of, a thirty-six inch lathe without screw and gearing, a thirty-two inch lathe with screw and gearing, a forty-inch lathe triple geared or double geared, with a twenty or thirty foot frame, and so on. To avoid this it is necessary to assume symbols for machines of different classes, consisting generally of the letters of the alphabet, qualified by a single number as an exponent to designate capacity or different modifications. Assuming, in the case of engine lathes, A to be the symbol for lathes of all sizes, then those of different capacity and modification can be represented in the drawings and records as A1, A2, A3, A4, and so on, requiring but two characters to indicate a lathe of any kind. These symbols should be marked in large plain letters on the left-hand lower corner of sheets, so that the manager, workman, or any one else, can see at a glance what the [86] drawings relate to. This symbol should run through the time-book, cost account, sales record, and be the technical name for machines to which it applies; in this way machines will always be spoken of in the works by the name of their symbol.The life preserver was jerked away by the jar when the parachute arrested the fall sharply, making it impossible for a handgrip to retain the rope of the swiftly plunging white circle.
TWO:"Found out a lot," said the first policeman. "This motor's as bright as your lantern really, It's all covered over with blacklead."
TWO:There the German authorities detained me for a full week, by prohibiting me to return: "for the sake of your own safety," they told me courteously. During the day I was busy enough, and in the evenings I enjoyed the pleasant company of the three fathers of the Sacred Heart who had remained in the137 mission house, and with whose photographic instrument I took many a snapshot of the Louvain ruins.
TWO:I shuddered at the thought that in these days such barbarities were possible. I asked the soldiers whether I was allowed to enter the burning village, but the commanding sergeant refused his consent."A glass of beer, madame."
TWO:"Then I shall shoot."This Daemonium, whatever it may have been, formed one of the ostensible grounds on which its possessor was prosecuted and condemned to death for impiety. We might have spared ourselves the trouble of going over the circumstances connected with that tragical event, had not various attempts been made in some well-known works to extenuate the significance of a singularly atrocious crime. The case stands thus. In the year 399 B.C. Socrates, who was then over seventy, and had never in his life been brought before a law-court, was indicted on the threefold charge of introducing new divinities, of denying those already recognised by the State, and of corrupting young men. His principal accuser was one Meltus, a poet, supported by Lycon, a rhetorician,162 and by a much more powerful backer, Anytus, a leading citizen in the restored democracy. The charge was tried before a large popular tribunal, numbering some five hundred members. Socrates regarded the whole affair with profound indifference. When urged to prepare a defence, he replied, with justice, that he had been preparing it his whole life long. He could not, indeed, have easily foreseen what line the prosecutors would take. Our own information on this point is meagre enough, being principally derived from allusions made by Xenophon, who was not himself present at the trial. There seems, however, no unfairness in concluding that the charge of irreligion neither was nor could be substantiated. The evidence of Xenophon is quite sufficient to establish the unimpeachable orthodoxy of his friend. If it really was an offence at Athens to believe in gods unrecognised by the State, Socrates was not guilty of that offence, for his Daemonium was not a new divinity, but a revelation from the established divinities, such as individual believers have at all times been permitted to receive even by the most jealous religious communities. The imputation of infidelity, commonly and indiscriminately brought against all philosophers, was a particularly unhappy one to fling at the great opponent of physical science, who, besides, was noted for the punctual discharge of his religious duties. That the first two counts of the indictment should be so frivolous raises a strong prejudice against the third. The charges of corruption seem to have come under two headsalleged encouragement of disrespect to parents, and of disaffection towards democratic institutions. In support of the former some innocent expressions let fall by Socrates seem to have been taken up and cruelly perverted. By way of stimulating his young friends to improve their minds, he had observed that relations were only of value when they could help one another, and that to do so they must be properly educated. This was twisted into an assertion that ignorant parents might properly be placed163 under restraint by their better-informed children. That such an inference could not have been sanctioned by Socrates himself is obvious from his insisting on the respect due even to so intolerable a mother as Xanthipp.108 The political opinions of the defendant presented a more vulnerable point for attack. He thought the custom of choosing magistrates by lot absurd, and did not conceal his contempt for it. There is, however, no reason for believing that such purely theoretical criticisms were forbidden by law or usage at Athens. At any rate, much more revolutionary sentiments were tolerated on the stage. That Socrates would be no party to a violent subversion of the Constitution, and would regard it with high disapproval, was abundantly clear both from his life and from the whole tenor of his teaching. In opposition to Hippias, he defined justice as obedience to the law of the land. The chances of the lot had, on one memorable occasion, called him to preside over the deliberations of the Sovereign Assembly. A proposition was made, contrary to law, that the generals who were accused of having abandoned the crews of their sunken ships at Arginusae should be tried in a single batch. In spite of tremendous popular clamour, Socrates refused to put the question to the vote on the single day for which his office lasted. The just and resolute man, who would not yield to the unrighteous demands of a crowd, had shortly afterwards to face the threats of a frowning tyrant. When the Thirty were installed in power, he publicly, and at the risk of his life, expressed disapproval of their sanguinary proceedings. The oligarchy, wishing to involve as many respectable citizens as possible in complicity with their crimes, sent for five persons, of whom Socrates was one, and ordered them to bring a certain Leo from Salamis, that he might be put to death; the others obeyed, but Socrates refused to accompany them on their disgraceful errand. Nevertheless, it told heavily against the philosopher that164 Alcibiades, the most mischievous of demagogues, and Critias, the most savage of aristocrats, passed for having been educated by him. It was remembered, also, that he was in the habit of quoting a passage from Homer, where Odysseus is described as appealing to the reason of the chiefs, while he brings inferior men to their senses with rough words and rougher chastisement. In reality, Socrates did not mean that the poor should be treated with brutality by the rich, for he would have been the first to suffer had such license been permitted, but he meant that where reason failed harsher methods of coercion must be applied. Precisely because expressions of opinion let fall in private conversation are so liable to be misunderstood or purposely perverted, to adduce them in support of a capital charge where no overt act can be alleged, is the most mischievous form of encroachment on individual liberty.

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Be this as it may, Spinoza takes up the Aristotelian identification of logical with dynamical connexion, and gives it the widest possible development. For the Stagirite would not, at any rate, have dreamed of attributing any but a subjective existence to the demonstrative series, nor of extending it beyond the limits of our actual knowledge. Spinoza, on the other hand, assumes that the whole infinite chain of material causes is represented by a corresponding chain of eternal ideas; and this chain he calls the infinite intellect of God.566 Here, besides the necessities of systematisation, the411 influence of mediaeval realism is plainly evident. For, when the absolute self-existence of Platos Ideas had been surrendered in deference to Aristotles criticism, a home was still found for them by Plotinus in the eternal Nous, and by the Christian Schoolmen in the mind of God; nor did such a belief present any difficulties so long as the divine personality was respected. The pantheism of Spinoza, however, was absolute, and excluded the notion of any but a finite subjectivity. Thus the infinite intellect of God is an unsupported chain of ideas recalling the theory at one time imagined by Plato.567 Or its existence may be merely what Aristotle would have called potential; in other words, Spinoza may mean that reasons will go on evolving themselves so long as we choose to study the dialectic of existence, always in strict parallelism with the natural series of material movements constituting the external universe; and just as this is determined through all its parts by the totality of extension, or of all matter (whether moving or motionless) taken together, so also at the summit of the logical series stands the idea of God, from whose definition the demonstration of every lesser idea necessarily follows. It is true that in a chain of connected energies the antecedent, as such, must be always precisely equal to the consequent; but, apparently, this difficulty did not present itself to Spinoza, nor need we be surprised at this; for Kant, coming a century later, was still so imbued with Aristotelian traditions as, similarly, to derive the category of Cause and Effect from the relation between Reason and Consequent in hypothetical propositions.568Fugitives arrived from the surrounding villages, who also spoke of nothing but arson, destruction, and murder. They frightened the Lige population still more, hundreds of whom packed up some of their belongings and fled. They stumbled and fell across the barricades in the streets, blinded as they were by fear, and blinded also by the smoke which settled down on the city and polluted the air.The intricacy of the subject renders it a difficult one to deal with except by the aid of diagrams, and as such mechanism may be inspected in almost any machine fitting shop, attention is called to the subject as one of the best that can be chosen for demonstration by diagrams. Problems of these variable speed movements are not only of great interest, but have a practical importance not found in many better known problems which take up time uselessly and have no application in a practical way.
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