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ONE:A gravity wheel must have a diameter equal to the fall of water, or, to use the technical name, the height of the head. The speed at the periphery of the wheel cannot well exceed sixteen feet per second without losing a part of the effect by the wheel anticipating or overrunning the water. This, from the large diameter of the wheels, produces a very slow axial speed, and a train of multiplying gearing becomes necessary in order to reach the speed required in most operations where power is applied. This train of gearing, besides being liable to wear [38]and accident, and costing usually a large amount as an investment, consumes a considerable part of the power by frictional resistance, especially when such gearing consists of tooth wheels. Gravity wheels, from their large size and their necessarily exposed situation, are subject to be frozen up in cold climates; and as the parts are liable to be first wet and then dry, or warm and cold by exposure to the air and the water alternately, the tendency to corrosion if constructed of iron, or to decay if of wood, is much greater than in submerged wheels. Gravity wheels, to realise the highest measure of effect from the water, require a diameter so great that they must drag in the water at the bottom or delivering side, and are for this reason especially affected by back-water, to which all wheels are more or less liable from the reflux of tides or by freshets. These disadvantages are among the most notable pertaining to gravity wheels, and have, with other reasonssuch as the inconvenience of construction, greater cost, and so ondriven such wheels out of use by the force of circumstances, rather than by actual tests or theoretical deductions.

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TWO:Ghastly reminders of their former feasts.192"I am afraid I am utterly in the dark, Lawrence," said Charlton.

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TWO:

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TWO:2. Never seen anyone who was arrested as a franc-tireur.The woman reached up a long white hand, and taking the bulb of the swinging electric light in her grasp desperately, crushed it to pieces. Then there was swift darkness again and the rush of flying feet.

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TWO:Gifford murmured something about the honour and pleasure. There was no vehicle to be seen in the dark street besides the gleaming mass of brass and steel that quietly simmered by the pavement.

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TWO:(1.) Under what conditions is hydraulic apparatus a suitable means for transmitting power?(2.) To what class of operations is hydraulic apparatus mostly applied?(3.) Why is not water as suitable a medium as air or steam in transmitting power for general purposes?
FORE:PREFACEAfter the explanations required of us they allowed us to go on. The incessant roar of the guns made the girl tremble for fear, and the stinging smoke made her cough. After much trouble we got at last as far as Herstal, where I had promised her a short rest.

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FORE:I had a fortune teller read the cards for me, Jeff told him. The nine o spadesthe worst card of warning in the packwas right over me and that means troubleand the ace of spades, a bad card

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FORE:Lawrence was profoundly interested in what Prout had to say. The latter had given far more information than he had imagined.

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FORE:"Oh, no," Hetty cried. "She never could have done that. Her own child, Bruce? Fancy a mother sacrificing the life of her own child to gratify a vengeance! I could not think as badly of her as that."

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FORE:"Perhaps you had better describe this motor," said the coroner.There is a problem as to the principle of action in a Barker wheel, which although it may be very clear in a scientific sense, remains a puzzle to the minds of many who are well versed in mechanics, some contending that the power is directly from pressure, others that it is from the dynamic effect due to reaction. It is one of the problems so difficult to determine by ordinary standards, that it serves as a matter of endless debate between those who hold different views; and considering the advantage usually derived from such controversies, perhaps the best manner of disposing of the problem here is to state the two sides as clearly as possible, and leave the reader to determine for himself which he thinks right.

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FORE:The sight of that small group, hidden among the green foliage, was as brilliant as it was surprising. One of the officers, clearly the highest in rank, summoned us to come nearer, and asked the soldiers for an explanation. Standing smartly at attention, they gave it, as a school-child might haltingly recite a lesson learned by heart. The officer whom I thought it convenient to call "Captain" looked searchingly at me and then began:

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FORE:"It's about those letters I found in your possession," Prout said, "the letters to you from your brother. I know they are from your brother, because I have seen him, and also his handwriting. You need not be afraid of him, because he is far beyond being injured by any one in the world."

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FORE:Fear reigned everywhere in the bustling streets; people shouted at each other that the villages burned already, that by and by they would start with the town, that all civilians would be killed, and other terrible things. The Germans looked at all this with cynical composure, and when I asked some of them what the truth was, they shrugged their shoulders, said that they knew nothing about it, but that it might be true, because all Belgians were swine who shot at the soldiers or poisoned them. All of them were furious because the Belgians did not allow them to march through their country.

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FORE:

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TWO:"Ah!" she exclaimed. "I had forgotten that. In the press of other things it had been swept out of my mind. A professional acrobat like yourself should make light of a task like that. The way is all clear for the experiment. But when?"When we entered the town in our motor-car, those of the unfortunate population who had escaped from the murderous massacre had already left the town. Between the ruins and the deserted French Red Cross cars we drove to the pontoon bridge which the Germans had flung across the river by the side of the Meuse bridge, which had been blown up. Here we were stopped by German soldiers who guarded the pontoon bridge. In a caf we came across a few of the citizens who had remained. These unfortunate people had no home, no money, and no food, lacked the wherewithal to go farther away, and now depended on the charity of the murderers of their relatives. Twice a day they were allowed to call at one of the German stores for a piece of bread, in exchange for a ticket which167 they might get at the commander's office. The Germans, upholders of morality and "Kultur," saw to it that their victims did not overeat themselves.

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THREE:He swung his head, signaled Dick, waved an arm, pointing. Dick and Larry stared, while Sandy poked Jeff and repeated his gestures.That Plato put forward the ethical theory of the Protagoras in perfect good faith cannot, we think, be doubted; although in other writings he has repudiated hedonism with contemptuous aversion; and it seems equally evident that this was his earliest contribution to positive thought. Of all his theories it is the simplest and most Socratic; for Socrates, in endeavouring to reclaim the foolish or vicious, often spoke as if self-interest was the paramount principle of human nature; although, had his assumption been formulated as an abstract proposition, he too might have shrunk from it with something of the uneasiness attributed to Protagoras. And from internal evidence of another description we have reason to think that the Dialogue in question is a comparatively juvenile production, remembering always that the period of youth was much more189 protracted among the Greeks than among ourselves. One almost seems to recognise the hand of a boy just out of college, who delights in drawing caricatures of his teachers; and who, while he looks down on classical scholarship in comparison with more living and practical topics, is not sorry to show that he can discuss a difficult passage from Simonides better than the professors themselves.

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THREE:Larry and Dick straightened and stared in surprise. It was very plain to be seen that Sandy was not joking.Trap you?
TWO:

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227The curious one shrugged his shoulders. Then a loud clear voice rang to the roof, the voice of a woman who declared that she could prove it. A ripple of amazement followed. Before it died away Hetty became conscious of the fact that the voice was hers, and that she had spoken.So far, we have only considered belief in its relation to the re-distribution of political, social, and national forces. But behind all such forces there is a deeper and more perennial cause of intellectual revolution at work. There is now in the world an organised and ever-growing mass of scientific truths, at least a thousand times greater and a thousand times more diffused than the amount of positive knowledge possessed by mankind in the age of the Antonines. What those truths can do in the future may be inferred from what they have already done in the past. Even the elementary science of Alexandria, though it could not cope with the supernaturalist reaction of the empire, proved strong enough, some centuries later, to check the flood of Mahometan fanaticism, and for a time to lead captivity captive in the very strongholds of militant theological belief. When, long afterwards, Jesuitism and Puritanism between them threatened to reconquer all that the humanism of the Renaissance had won from superstition, when all Europe from end to end was red with the blood or blackened with the death-fires of heretics and witches, science, which had meanwhile been silently laying the foundations of265 a new kingdom, had but to appear before the eyes of men, and they left the powers of darkness to follow where she led. When the follies and excesses of the Revolution provoked another intellectual reaction, her authority reduced it to a mere mimicry and shadow of the terrible revenges by which analogous epochs in the past history of opinion had been signalised. And this was at a time when the materials of reaction existed in abundance, because the rationalistic movement of the eighteenth century had left the middle and lower classes untouched. At the present moment, Catholicism has no allies but a dispirited, half-sceptical aristocracy; and any appeal to other quarters would show that her former reserves have irrevocably passed over to the foe. What is more, she has unconsciously been playing the game of rationalism for fifteen centuries. By waging a merciless warfare on every other form of superstition, she has done her best to dry up the sources of religious belief. Those whom she calls heathens and pagans lived in an atmosphere of supernaturalism which rendered them far less apt pupils of philosophy than her own children are to-day. It was harder to renounce what she took away than it will be to renounce what she has left, when the truths of science are seen by all, as they are now seen by a few, to involve the admission that there is no object for our devotion but the welfare of sentient beings like ourselves; that there are no changes in Nature for which natural forces will not account; and that the unity of all existence has, for us, no individualisation beyond the finite and perishable consciousness of man.Although I had got farther on my way than I had dared to expect, my journalist's heart longed for more. If I could get to Lige, which was said to have just been taken! But my passport stated that I was only allowed to go to Vis. I thought the matter out, and the longer I thought, the stronger became my desire to go on; and at last I decided to do it."Dr. Bruce perfectly understands," Lady Rockingham said coldly.
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