Next day I was already back in Lige, where much was changed after my last visit. The Germans went on terrorising the inhabitants, and these, being extremely frightened, looked with suspicion at every stranger. In the streets was the smoke of burning houses, especially from Outre-Meuse.
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 streets offered the same aspect as those at Vis. From each house floated the pitiful little white flag; the people sat together on their "stoeps," for they did not venture out in the streets. Everywhere I was again saluted in the same cringingly polite manner, and eyed with suspicion.
ONE: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.The subject of steam-power, aside from its mechanical consideration, is one that may afford many useful lessons, by tracing its history and influence, not only upon mechanical industry, but upon human interests generally. This subject is often treated of, and both its interest and importance conceded; but no one has, so far as I know, from statistical and other sources, ventured to estimate in a methodical way the changes that can be traced directly and indirectly to steam-power.
ONE:In operating by elastic blows, the steam piston is cushioned at both the up and down stroke, and the action of a steam-hammer corresponds to that of a helve trip-hammer, the steam filling the office of a vibrating spring; in this case a hammer gives a quick rebounding blow, the momentum being only in part [111] spent upon the work, and partly arrested by cushioning on the steam in the bottom of the cylinder under the piston."Ah, then, you must dissemble with her. Tell her any lie you like so long as you let Dr. Bruce alone. I guessed there was some scheme on hand when I heard that you had written to the Doctor. Goodbye, Wolffman, and recollect that your ruin or otherwise depends upon yourself."
THREE:Finally, by the form which he gave to Platonism, Plotinus has had a large share in determining the direction of modern metaphysics. Although, as we have seen, not, properly speaking, a pantheist himself, he showed how the ideal theory could be transformed into a pantheistic system, and pantheism it immediately became when the peculiar limitations and subtleties of Greek thought had ceased to dominate over the western mind, and when the restraints of Catholic orthodoxy had been removed or relaxed. The stream of tendency in this direction runs all through the Middle Ages, and acquires new volume and momentum at the Renaissance, until, by a process which will be analysed in the next chapter, it reaches its supreme expansion in the philosophy of Spinoza. Then, after a long pause, it is taken up by Kants successors, and combined with the subjective idealism of modern psychology, finally passing, through the intervention of Victor Cousin and Sir William Hamilton, into the philosophy of Mr. Herbert Spencer.The Epicurean philosophy of external Nature was used as an instrument for destroying the uncomfortable belief in Divine Providence. The Epicurean philosophy of mind was used to destroy the still more uncomfortable belief in mans immortality. As opinions then stood, the task was a comparatively easy one. In our discussion of Stoicism, we observed that the spiritualism of Plato and Aristotle was far before their age, and was not accepted or even understood by their countrymen for a long time to come. Moreover, Aristotle did not agree with his master in thinking that the personal eternity of the soul followed from its immateriality. The belief of the Stoics in a prolongation of individual existence until the destruction of all created things by fire, was, even in that very limited form, inconsistent with their avowed materialism, and had absolutely no influence on their practical89 convictions. Thus Platos arguments were alone worth considering. For Epicurus, the whole question was virtually settled by the principle, which he held in common with the Stoics, that nothing exists but matter, its attributes, and its relations. He accepted, it is true, the duality of soul and body, agreeing, in this respect also, with the Stoics and the earlier physicists; and the familiar antithesis of flesh and spirit is a survival of his favourite phraseology;173 but this very term flesh was employed to cover the assumption that the body to which he applied it differed not in substance but in composition from its animating principle. The latter, a rather complex aggregate, consists proximately of four distinct elements, imagined, apparently, for the purpose of explaining its various functions, and, in the last analysis, of very fine and mobile atoms.174 When so much had been granted, it naturally followed that the soul was only held together by the body, and was immediately dissolved on being separated from ita conclusion still further strengthened by the manifest dependence of psychic on corporeal activities throughout the period of their joint existence. Thus all terrors arising from the apprehension of future torments were summarily dispelled.
THREE:Dimension lines should be in blue, but may be in red. Where to put them is a great point in draughting. To know where dimensions are required involves a knowledge of fitting and pattern-making, and cannot well be explained; it must be learned in practice. The lines should be fine and clear, leaving a space in their centre for figures when there is room. The distribution of centre lines and dimensions over a drawing must be carefully studied, for the double purpose of giving it a good appearance and to avoid confusion. Figures should be made like printed numerals; they are much better understood by the workman, look more artistic, and when once learned require but little if any more time than written figures. If the scale employed is feet and inches, dimensions to three feet should be in inches, and above this in feet and inches; this corresponds to shop custom, and is more comprehensive to the workman, however wrong it may be according to other standards.
The auxiliary departments, if disposed about an erecting shop in the centre, should be so arranged that material which has to pass through two or more departments can do so in the order of the processes, and without having to cross the erecting shop. Casting, boring, planing, drilling, and fitting, for example, should follow each other, and the different departments be arranged accordingly; whenever a casting is moved twice over the same course, it shows fault of arrangement and useless expense. The same rule applies to all kinds of material.III.If Plato stands at the very antipodes of Fourier and St. Simon, he is connected by a real relationship with those thinkers who, like Auguste Comte and Mr. Herbert Spencer, have based their social systems on a wide survey of physical science and human history. It is even probable that his ideas have exercised a decided though not a direct influence on the two writers whom we have named. For Comte avowedly took many of his proposed reforms from the organisation of mediaeval Catholicism, which was a translation of philosophy into dogma and discipline, just as Positivism is a re-translation of theology into the human thought from which it sprang. And Mr. Spencers system, while it seems to be the direct antithesis of Platos, might claim kindred with it through the principle of differentiation and integration, which, after passing from Greek thought into political economy and physiology, has been restored by our illustrious countryman to something more than its original generality. It has also to be observed that the application of very abstract truths to political science needs to be most jealously guarded, since their elasticity increases in direct proportion to their width. When one thinker argues from the law of increasing specialisation to a vast extension of governmental interference with personal liberty, and another thinker to its restriction within the narrowest possible limits, it seems time to consider whether experience and expediency are not, after all, the safest guides to trust.Out of this eternal unchanging divine substance, which he calls aether, are formed the heavenly bodies and the transparent spheres containing them. But there is something beyond it of an even higher and purer nature. Aristotle proves, with great subtlety, from his fundamental assumptions, that the movement of an extended substance cannot be self-caused. He also proves that motion must be absolutely continuous and without a beginning. We have, therefore, no choice but to accept the existence of an unextended, immaterial, eternal, and infinite Power on which the whole cosmos depends.The range and speed of movement of the parts of machines are elements in designing that admit of a definite determination from the work to be accomplished, but arrangement cannot be so determined, and is the most difficult to find data for. To sum [154] up these propositions we have:
