FORE:5. Every part laid down has something to govern it that may be termed a "base"some condition of function or position which, if understood, will suggest size, shape, and relation to other parts. By searching after a base for each and every part and detail, the draughtsman proceeds upon a regular system, continually maintaining a test of what is done. Every wheel, shaft, screw or piece of framing should be made with a clear view of the functions it has to fill, and there are, as before said, always reasons why such parts should be of a certain size, have such a speed of movement, or a certain amount of bearing surface, and so on. These reasons or conditions may be classed as expedient, important, or essential, and must be estimated accordingly. As claimed at the beginning, the designs of machines can only in a limited degree be determined by mathematical data. Leaving out all considerations of machine operation with which books have scarcely attempted to deal, we have only to refer to the element of strains to verify the general truth of the proposition.We perceive a precisely similar change of tone on comparing the two great historians who have respectively recorded the struggle of Greece against Persia, and the struggle of imperial Athens against Sparta and her allies. Though born within fifteen years of one another, Herodotus and Thucydides are virtually separated by an interval of two generations, for while the latter represents the most advanced thought of his time, the former lived among traditions inherited from the age preceding his own. Now, Herodotus is not more remarkable for the earnest piety than for the clear sense of justice which runs through his entire work. He draws no distinction between public and private morality. Whoever makes war on his neighbours without provocation, or rules without the consent of the governed, is, according to him, in the wrong, although he is well aware that such wrongs are constantly committed. Thucydides knows nothing74 of supernatural interference in human affairs. After relating the tragical end of Nicias, he observes, not without a sceptical tendency, that of all the Greeks then living, this unfortunate general least deserved such a fate, so far as piety and respectability of character went. If there are gods they hold their position by superior strength. That the strong should enslave the weak is a universal and necessary law of Nature. The Spartans, who among themselves are most scrupulous in observing traditional obligations, in their dealings with others most openly identify gain with honour, and expediency with right. Even if the historian himself did not share these opinions, it is evident that they were widely entertained by his contemporaries, and he expressly informs us that Greek political morality had deteriorated to a frightful extent in consequence of the civil discords fomented by the conflict between Athens and Sparta; while, in Athens at least, a similar corruption of private morality had begun with the great plague of 430, its chief symptom being a mad desire to extract the utmost possible enjoyment from life, for which purpose every means was considered legitimate. On this point Thucydides is confirmed and supplemented by the evidence of another contemporary authority. According to Aristophanes, the ancient discipline had in his time become very much relaxed. The rich were idle and extravagant; the poor mutinous; young men were growing more and more insolent to their elders; religion was derided; all classes were animated by a common desire to make money and to spend it on sensual enjoyment. Only, instead of tracing back this profound demoralisation to a change in the social environment, Aristophanes attributes it to demagogues, harassing informers, and popular poets, but above all to the new culture then coming into vogue. Physical science had brought in atheism; dialectic training had destroyed the sanctity of ethical restraints. When, however, the religious and virtuous Socrates is put forward as a type of both tend75encies, our confidence in the comic poets accuracy, if not in his good faith, becomes seriously shaken; and his whole tone so vividly recalls the analogous invectives now hurled from press and pulpit against every philosophic theory, every scientific discovery, every social reform at variance with traditional beliefs or threatening the sinister interests which have gathered round iniquitous institutions, that at first we feel tempted to follow Grote in rejecting his testimony altogether. So far, however, as the actual phenomena themselves are concerned, and apart from their generating antecedents, Aristophanes does but bring into more picturesque prominence what graver observers are content to indicate, and what Plato, writing a generation later, treats as an unquestionable reality. Nor is the fact of a lowered moral tone going along with accelerated mental activity either incredible or unparalleled. Modern history knows of at least two periods remarkable for such a conjunction, the Renaissance and the eighteenth century, the former stained with every imaginable crime, the latter impure throughout, and lapsing into blood-thirsty violence at its close. Moral progress, like every other mode of motion, has its appropriate rhythmits epochs of severe restraint followed by epochs of rebellious license. And when, as an aggravation of the reaction from which they periodically suffer, ethical principles have become associated with a mythology whose decay, at first retarded, is finally hastened by their activity, it is still easier to understand how they may share in its discredit, and only regain their ascendency by allying themselves with a purified form of the old religion, until they can be disentangled from the compromising support of all unverified theories whatever. We have every reason to believe that Greek life and thought did pass through such a crisis during the second half of the fifth century B.C., and we have now to deal with the speculative aspects of that crisis, so far as they are represented by the Sophists.
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FORE:6. The loss of power in a steam-engine arises from the heat carried off in the exhaust steam, loss by radiation, and the friction of the moving parts.The road was all strewn with straw. I approached the bridge past burning farms and villas. There the pieces of broken furniture were even lying in the road, and I had to go warily so that I should not stumble. The soldiers looked at me as if they were amused, but I went up to them in the same unconcerned manner and asked them to take me to their commanding officer.
FORE:And he summoned me to look at the map, where he pointed out to me where Maastricht was.Sixth.Inherent, or cooling strains, that may either spring and warp castings, or weaken them by maintained tension in certain partsa condition that often requires a disposition of the metal quite different from what working strains demand.
