FORE:170The latter seems a plausible theory, and perhaps a correct one; but there are two facts in connection with the operation of reaction water-wheels which seem to controvert the latter and favour the first theory, namely, that reaction wheels in actual practice seldom utilise more than forty per cent. of useful effect from the water, and that their speed may exceed the initial velocity of the water. With this the subject is left as one for argument or investigation on the part of the reader.
Cras consequat iaculis lorem, id vehicula erat mattis quis. Vivamus laoreet velit justo, in ven e natis purus.
FORE:We must now bring this long and complicated, but it is hoped not uninteresting, study to a close. We have accompanied philosophy to a point where it enters on a new field, and embraces themes sufficiently important to form the subject of a separate chapter. The contributions made by its first cultivators to our positive knowledge have already been summarised. It remains to mention that there was nothing of a truly transcendental character about their speculations. Whatever extension we may give to that terrible bugbear, the Unknowable, they did not trespass on its domain. Heracleitus and his compeers, while penetrating far beyond the horizon of their age and country, kept very nearly within the limits of a possible experience. They confused some conceptions which we have learned to distinguish, and separated others which we have learned to combine; but they were the lineal progenitors of our highest scientific thought; and they first broke ground on a path where we must continue to advance, if the cosmos which they won for us is not to be let lapse into chaos and darkness again.
Cras consequat iaculis lorem, id vehicula erat mattis quis. Vivamus laoreet velit justo, in ven e natis purus.
FORE:When the power and value of these primitive speculations can no longer be denied, their originality is sometimes questioned by the systematic detractors of everything Hellenic. Thales and the rest, we are told, simply borrowed their theories without acknowledgment from a storehouse of Oriental wisdom on which the Greeks are supposed to have drawn as freely as Coleridge drew on German philosophy. Sometimes each system is affiliated to one of the great Asiatic religions; sometimes they are all traced back to the schools of Hindostan. It is natural that no two critics should agree, when the rival explanations are based on nothing stronger than superficial analogies and accidental coincidences. Dr. Zeller in his wonderfully learned, clear, and sagacious work on Greek philosophy, has carefully sifted some of the hypotheses referred to, and shown how destitute they are of internal or external evidence, and how utterly they fail to account for the facts. The oldest and best authorities, Plato and Aristotle, knew nothing about such a derivation of Greek thought from Eastern sources. Isocrates does, indeed, mention that Pythagoras borrowed his philosophy7 from Egypt, but Isocrates did not even pretend to be a truthful narrator. No Greek of the early period except those regularly domiciled in Susa seems to have been acquainted with any language but his own. Few travelled very far into Asia, and of those few, only one or two were philosophers. Democritus, who visited more foreign countries than any man of his time, speaks only of having discussed mathematical problems with the wise men whom he encountered; and even in mathematics he was at least their equal.9 It was precisely at the greatest distance from Asia, in Italy and Sicily, that the systems arose which seem to have most analogy with Asiatic modes of thought. Can we suppose that the traders of those times were in any way qualified to transport the speculations of Confucius and the Vedas to such a distance from their native homes? With far better reason might one expect a German merchant to carry a knowledge of Kants philosophy from K?nigsberg to Canton. But a more convincing argument than any is to show that Greek philosophy in its historical evolution exhibits a perfectly natural and spontaneous progress from simpler to more complex forms, and that system grew out of system by a strictly logical process of extension, analysis, and combination. This is what, chiefly under the guidance of Zeller, we shall now attempt to do."Between midnight and a quarter past," he muttered. "That's about the time. We had better creep a little closer to the window. That's one advantage of being in a house in the dark--you can see everything that is going on outside without being spotted by anybody. Come along and see what you shall see."
Cras consequat iaculis lorem, id vehicula erat mattis quis. Vivamus laoreet velit justo, in ven e natis purus.
FORE:Referring first to the saving effected by combining several operations in one machine, there is perhaps not one constructor in twenty that ever stops to consider what is really gained, and perhaps not one purchaser in a hundred that does the same thing. The impression is, that when one machine performs two operations it saves a second machine. A remarkable example of this exists in the manufacture of combination machines in Europe for working wood, where it is common to find complicated [69] machines that will perform all the operations of a joiner's shop, but as a rule only one thing at a time, and usually in an inconvenient manner, each operation being hampered and interfered with by another; and in changing from one kind of work to another the adjustments and changes generally equal and sometimes exceed the work to be done. What is stranger still is, that such machines are purchased, when their cost often equals that of separate machines to perform the same work."I don't know yet. The things I see ... and ... of course that cannot do harm to the German army."
Cras consequat iaculis lorem, id vehicula erat mattis quis. Vivamus laoreet velit justo, in ven e natis purus.
FORE:"In Amsterdam...."For that fog the seaplane was making at full speed.
FORE:There was no further hesitation. This was an adventure after the woman's own heart. With the purloined cloak covering her from head to foot she passed down the steps and into the roadway. Nobody noticed her, for the spectacle was not a very uncommon one. Under the shadow of the portico a little way off stood a motor, watched by a nightbird who would have done anything for a few coppers.Ren had no intention of doing anything of the kind. A dim, blue-coated figure stood in the doorway of the dining-room. With one spring Ren was upon him, and carried him to the floor. There was a groan and a snarl and a snore, and the policeman lay on his back utterly oblivious for the moment.
FORE:
FORE:Judged upon theoretical grounds, and leaving out the mechanical conditions of operation, it would at once be conceded that a proper plan would be to move the lightest body; that is, if the tools and their attachments were heavier than the material to be acted upon, then the material should be moved for the cutting action, and vice versa. But in practice there are other conditions to be considered more important than a question of the relative weight of reciprocating parts; and it must be remembered that in solving any problem pertaining to machine action, the conditions of operation are to be considered first and have precedence over problems of strain, arrangement, or even the general principles of construction; that is, the conditions of operating must form a base from which proportions, arrangements, and so on, must be deduced. A standard planing machine, such as is employed for most kinds of work, is arranged with a running platen or carriage upon which the material is fastened and traversed beneath the cutting tools. [130] The uniformity of arrangement and design in machines of this kind in all countries wherever they are made, must lead to the conclusion that there are substantial reasons for employing running platens instead of giving a cutting movement to the tools.
FORE:After eliminating all the sources of misery due to folly and vice, Epicurus had still to deal with what, in his opinion, were the most formidable obstacles to human happiness, dread of the divine anger and dread of death, either in itself, or as the entrance on another life. To meet these, he compiled, for we can hardly say constructed, an elaborate system of physical philosophy, having for its object to show that Nature is entirely governed by mechanical causes, and that the soul perishes with the body. We have already mentioned that for science as such and apart from its ethical applications he neither cared nor pretended to care in the least. It seems, therefore, rather surprising that he could not manage, like the Sceptics before him, to get rid of supernaturalism by a somewhat more expeditious method. The explanation seems to be that to give some account of natural phenomena had become, in his time, a necessity for every one aspiring to found a philosophical system. A brilliant example had been set by Plato and Aristotle, of whom the former, too, had apparently yielded to the popular demand rather than followed the bent of his own genius, in turning aside from ethics to physics; and Zeno had similarly included the whole of knowledge in his teaching. The old Greek curiosity respecting the causes of things was still alive; and a similar curiosity was doubtless awakening among those populations to whom Greek civilisation had been carried by colonisation, commerce, and conquest. Now, those scientific speculations are always the76 most popular which can be shown to have some bearing on religious belief, either in the way of confirmation or of opposition, according as faith or doubt happens to be most in the ascendent. Fifty years ago, among ourselves, no work on natural philosophy could hope for a large circulation unless it was filled with teleological applications. At present, liberal opinions are gaining ground; and those treatises are most eagerly studied which tend to prove that everything in Nature can be best explained through the agency of mechanical causation. At neither period is it the facts themselves which have excited most attention, but their possible bearing on our own interests. Among the contemporaries of Epicurus, the two currents of thought that in more recent times have enjoyed an alternate triumph, seem to have co-existed as forces of about equal strength. The old superstitions were rejected by all thinking men; and the only question was by what new faith they should be replaced. Poets and philosophers had alike laboured to bring about a religious reformation by exhibiting the popular mythology in its grotesque deformity, and by constructing systems in which pure monotheism was more or less distinctly proclaimed. But it suited the purpose, perhaps it gratified the vanity of Epicurus to talk as if the work of deliverance still remained to be done, as if men were still groaning under the incubus of superstitions which he alone could teach them to shake off. He seems, indeed, to have confounded the old and the new faiths under a common opprobrium, and to have assumed that the popular religion was mainly supported by Stoic arguments, or that the Stoic optimism was not less productive of superstitious terrors than the gloomy polytheism which it was designed to supersede.152
