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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.

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FORE:CHAPTER V. THE OBJECT OF MECHANICAL INDUSTRY."Close with her," yelled Lawrence, "she's got poison in her hand."
THREE:Modern admirers of Aristotle labour to prove that his errors were inevitable, and belonged more to his age than to himself; that without the mechanical appliances of modern times science could not be cultivated with any hope of success. But what are we to say when we find that on one point after another the true explanation had already been surmised by Aristotles predecessors or contemporaries, only to be scornfully rejected by Aristotle himself? Their hypotheses may often have been very imperfect, and supported by insufficient evidence; but it must have been something more than chance which always led him wrong when they were so often right. To begin with, the infinity of space is not even now, nor will it ever be, established by improved instruments of observation and measurement; it is deduced by a very simple process of reasoning, of which Democritus and others were capable, while Aristotle apparently was not. He rejects the idea because it is inconsistent with certain very arbitrary assumptions and definitions of his own, whereas he should have313 rejected them because they were inconsistent with it. He further rejects the idea of a vacuum, and with it the atomic theory, entirely on priori grounds, although, even in the then existing state of knowledge, atomism explained various phenomena in a perfectly rational manner which he could only explain by unmeaning or nonsensical phrases.195 It had been already maintained, in his time, that the apparent movements of the heavenly bodies were due to the rotation of the earth on its own axis.196 Had Aristotle accepted this theory one can imagine how highly his sagacity would have been extolled. We may, therefore, fairly take his rejection of it as a proof of blind adherence to old-fashioned opinions. When he argues that none of the heavenly bodies rotate, because we can see that the moon does not, as is evident from her always turning the same side to us,197 nothing is needed but the simplest mathematics to demonstrate the fallacy of his reasoning. Others had surmised that the Milky Way was a collection of stars, and that comets were bodies of the same nature as planets. Aristotle is satisfied that both are appearances like meteors, and the aurora borealiscaused by the friction of our atmosphere against the solid aether above it. A similar origin is ascribed to the heat and light derived from the sun and stars; for it would be derogatory to the dignity of those luminaries to suppose, with Anaxagoras, that they are formed of anything so familiar and perishable as fire. On the contrary, they consist of pure aether like the spheres on which they are fixed as protuberances; though314 how such an arrangement can co-exist with absolute contact between each sphere and that next below it, or how the effects of friction could be transmitted through such enormous thicknesses of solid crystal, is left unexplained.198 By a happy anticipation of Roemer, Empedocles conjectured that the transmission of light occupied a certain time: Aristotle declares it to be instantaneous.199"1. The young men need not fear that they will be taken to Germany in order to serve in the German army, or be compelled to do any work.

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THREE:The mission house had become a sanctuary for a good many people. As bread was lacking, two brothers fried pancakes all day long and distributed them among the numberless persons who asked for food. Among these were people who a few days earlier belonged to the well-to-do, but who saw their business, in which often more than their own capital was invested, wrecked by fire, and were now obliged to appeal to the charity of these monks. Indeed during the first weeks after that terrible event many starved, and I assisted often at the distribution of the pancakes, because they were short-handed."Ah, you have been down for Mamie," the Countess exclaimed. "She had one of her turns again. Give the poor child some of that soda-water and then follow me. Be quick."

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THREE:A woman in dark clothes had rushed behind the after cabin.They reached the kitchen window and looked out. There was a figure there, and what looked like another one in the background. A lantern stood on the flags; the first figure pitched something on the ground that looked like a coil of rope.

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THREE:Aristotle has sometimes been represented as an advocate of free-will against necessity. But the question had not really been opened in his time. He rejected fatalism; but it had not occurred to him that internal motives might exercise a constraining power over action. Nor has his freedom anything to do with the self-assertion of mind, its extrication from the chain of physical antecedents. It is simply the element of397 arbitrariness and uncertainty supposed to characterise the region of change and opposition, as distinguished from the higher region of undeviating regularity."Well, what is it you want tonight?" she demanded, haughtily.

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THREE:Machines and tools operating by percussive action, although they comprise a numerous class, and are applied in nearly all mechanical operations, have never received that amount of attention in text-books which the importance of the machines and their extensive use calls for. Such machines have not even been set off as a class and treated of separately, although the distinction is quite clear between machines with percussive action, and those with what may be termed direct action, both in the manner of operating and in the general plans of construction. There is, of course, no lack of formul? for determining the measure of force, and computing the dynamic effect of percussive machines acting against a measured or assumed resistance, and so on; but this is not what is meant. There are certain conditions in the operation of machines, such as the strains which fall upon supporting frames, the effect produced upon malleable material when struck or pressed, and more especially of conditions which may render percussive or positive acting machines applicable to certain purposes; but little explanation has been given which is of value to practical men.

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THREE:At once the hydroplane was manned and sent away, the yacht took up its own course, and Mr. Everdailto give him his own claimed titlepointed the airplanes nose for his estate. Sandy occupied the time of the flight by trying to piece together the strangely mixed jig-saw bits of their puzzleor was it only one puzzle?While all the others were denouncing me, one soldier was ready to believe that I was a peaceful foreign journalist, and that all the misunderstanding would disappear the next morning as soon as I should be taken to the commanding officer. He took pity on me, and got a thick soldier's coat for me as cover. I still feel grateful to the man for it! But sleep was out of the question on that wet floor, in the dense fog. When the guard was changed and soldiers came back, or others went, they could not see in the dark where they went, and treated me to a kick against my head or some other part of my body.

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FORE:The difference between hand and machine operations, and the labour-saving effect of machines, will be farther spoken of in another place; the subject is alluded to here, only to enable the reader to more fully distinguish between machinery of transmission and machinery of application. Machinery of application, directed to what has been termed compression processes, such as steam hammers, drops, presses, rolling mills, and so on, act upon material that is naturally soft and ductile, or when it is softened by heat, as in the case of forging.
    FORE:2. The capacity of shafts is governed by their strength and the speed at which they run taken together.

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FORE:Leona made no reply. Her eyes were fixed moodily on space. FORE:What remains of the visible world after deducting its ideal elements is pure space. This, which to some seems the clearest of all conceptions, was to Plato one of the obscurest. He can only describe it as the formless substance out of which the four elements, fire, air, water, and earth, are differentiated. It closes the scale of existence and even lies half outside it, just as the Idea of Good in the Republic transcends the same scale at the other end. We may conjecture that the two principles are opposed as absolute self-identity and absolute self-separation; the whole intermediate series of forms serving to bridge over the interval between them. It will then be easy to understand how, as Aristotle tells us, Plato finally came to adopt the Pythagorean nomenclature and designated his two generating principles as the monad and the indefinite dyad. Number was formed by their combination, and all other things were made out of number. Aristotle267 complains that the Platonists had turned philosophy into mathematics; and perhaps in the interests of science it was fortunate that the transformation occurred. To suppose that matter could be built up out of geometrical triangles, as Plato teaches in the Timaeus, was, no doubt, a highly reprehensible confusion; but that the systematic study of science should be based on mathematics was an equally new and important aper?u. The impulse given to knowledge followed unforeseen directions; and at a later period Platos true spirit was better represented by Archimedes and Hipparchus than by Arcesilaus and Carneades.Glory-gosh! he exclaimed, staring. FORE:The Countess was at home, and glad to see her visitor. The back drawing-room was cool and secluded and opened on to the garden. Leona Lalage lounged back in a deep chair and indicated the cigarettes on a table.

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FORE: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.

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FORE:After I had been incarcerated for about two hours I was taken to the commanding officer, Major Krittel, or rather to one of his subordinates, Captain Spuer, who was having a violent altercation with his chief. The captain appeared to insist with great force that the whole place should be burned down and all the prisoners shot. But the major seemed to be a tolerably reasonable man, tried to soothe the captain, and at last put down his foot, saying that he had had enough. The captain, a rude, fat fellow, sat down at a desk and bellowed at me:

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Invention, as applied to mechanical improvements, should not mean chance discovery. Such a meaning is often, if not generally, attached to the term invention, yet it must be seen that results attained by a systematic course of reasoning or experimenting can have nothing to do with chance or even discovery. Such results partake more of the nature of demonstrations, a name peculiarly suitable for such inventions as are the result of methodical purpose.Patterns and castings are so intimately connected that it would be difficult to treat of them separately without continually confounding them together; it is therefore proposed to speak of pattern-making and moulding under one head."'I might quote another small detail. Before the train228 arrived at Landen I had had a very pleasant chat in the corridor with a German soldier, who seemed tolerably humane and civilised, even in his talk. After the departure from Landen I again got into conversation with him, and did not fail to express my indignation; and then he gave me the following reply: "Oh well, one must think of the position of our soldiers, who have been for days in the trenches under the murderous fire of the enemy. Later on they will themselves repent for what has happened." Perhaps the German government may be able to discover who that soldier is, if I add that he went home for good because he was suffering from heart-disease."Accompany you. Presently, but not quite in the way you imagine. I have made my confession in a way that Mr. Lawrence thoroughly appreciates. It was I who murdered Leon Lalage, my husband, in this house; it was I who palmed those notes off on Dr. Bruce. No reason to tell you why now. And it was I in this very house who robbed my late mistress of her jewels and forged the letter from her husband that caused her to take poison. After that I have no more to say. Gentlemen, I am much obliged by your kind attention, and I say farewell to you, thus."Macaulay has spoken as if the Platonic philosophy was totally unrelated to the material wants of men. This, however, is a mistake. It is true that, in the Republic, science is not regarded as an instrument for heaping up fresh luxuries, or for curing the diseases which luxury breeds; but only because its purpose is held to be the discovery of those conditions under which a healthy, happy, and virtuous race can best be reared. The art of the true statesman is to weave the web of life with perfect skill, to bring together those couples from whose union the noblest progeny shall issue; and it is only by mastering the laws of the physical universe that this art can be acquired. Plato knew no natural laws but those of mathematics and astronomy; consequently, he set far too much store on the times and seasons at which bride and bridegroom were to meet, and on the numerical ratios by which they were supposed to be determined. He even tells243 us about a mysterious formula for discovering the nuptial number, by which the ingenuity of commentators has been considerably exercised. The true laws by which marriage should be regulated among a civilised people have remained wrapped in still more impenetrable darkness. Whatever may be the best solution, it can hardly fail to differ in many respects from our present customs. It cannot be right that the most important act in the life of a human being should be determined by social ambition, by avarice, by vanity, by pique, or by accidentin a word, by the most contemptible impulses of which human nature is susceptible; nor is it to be expected that sexual selection will always necessitate the employment of insincerity, adulation, and bribery by one of the parties concerned, while fostering in the other credulity, egoism, jealousy, capriciousness, and petty tyrannythe very qualities which a wise training would have for its object to root out.145
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