(1.) In what respect are air and water like belts and gearing, as means to transmit power?(2.) What are some of the principal advantages gained by employing air to operate railway brakes?(3.) Name some of the advantages of centralising motive power.(4.) Are the conditions of working an engine the same whether air or steam is employed?"And what do you want to write about?"
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ONE:I guess I better explain, Jeff decided. I didnt think you was so suspicious and quick or Id of done different.
TWO:Presuming the vertical shaft and the horizontal arms of a Barker wheel to be filled with water under a head of sixteen feet, there would be a pressure of about seven pounds upon each superficial inch of surface within the cross arm, exerting an equal force in every direction. By opening an orifice at the sides of these arms equal to one inch of area, the pressure would at that point be relieved by the escape of the water, and the internal [40] pressure be unbalanced to that extent. In other words, opposite this orifice, and on the other side of the arm, there would be a force of seven pounds, which being unbalanced, acts as a propelling power to drive the wheel.
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ONE:Following this proposition into modern engineering examples, we find how practice has gradually conformed to what these properties in belts suggest. Wire and other ropes of small diameter, to avoid air friction, and allowed to droop in low curves to avoid too many supporting pulleys, are now in many cases employed for transmitting power through long distances, as at Schaffhausen, in Germany. This system has been very successfully applied in some cases for distributing power in large manufacturing establishments. Belts, among which are included all flexible bands, do not afford the same facilities for [49]taking off power at different points as shafts, but have advantages in transmitting power to portable machinery, when power is to be taken off at movable points, as in the case of portable travelling cranes, machines, and so on.
TWO:Near each staircase stood a blackboard on which the Germans had written that to go upstairs was prohibited under penalty of death. The Head explained that the Germans alleged that light signals had been given from the top storey.
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TWO:From the time of Socrates on, the majority of Greeks, had they been asked what was the ultimate object of endeavour, or what made life worth living, would have answered, pleasure. But among professional philosophers such a definition of the60 supreme good met with little favour. Seeing very clearly that the standard of conduct must be social, and convinced that it must at the same time include the highest good of the individual, they found it impossible to believe that the two could be reconciled by encouraging each citizen in the unrestricted pursuit of his own private gratifications. Nor had such an idea as the greatest happiness of the greatest number ever risen above their horizon; although, from the necessities of life itself, they unconsciously assumed it in all their political discussions. The desire for pleasure was, however, too powerful a motive to be safely disregarded. Accordingly we find Socrates frequently appealing to it when no other argument was likely to be equally efficacious, Plato striving to make the private satisfaction of his citizens coincide with the demands of public duty, and Aristotle maintaining that this coincidence must spontaneously result from the consolidation of moral habits; the true test of a virtuous disposition being, in his opinion, the pleasure which accompanies its exercise. One of the companions of Socrates, Aristippus the Cyrenaean, a man who had cut himself loose from every political and domestic obligation, and who was remarkable for the versatility with which he adapted himself to the most varying circumstances, went still further. He boldly declared that pleasure was the sole end worth seeking, and on the strength of this doctrine came forward as the founder of a new philosophical school. According to his system, the summum bonum was not the total amount of enjoyment secured in a lifetime, but the greatest single enjoyment that could be secured at any moment; and this principle was associated with an idealistic theory of perception, apparently suggested by Protagoras, but carrying his views much further. Our knowledge, said Aristippus, is strictly limited to phenomena; we are conscious of nothing beyond our own feelings; and we have no right to assume the existence of any objects by which they are caused. The study of natural61 science is therefore waste of time; our whole energies should be devoted to the interests of practical life.123 Thus Greek humanism seemed to have found its appropriate sequel in hedonism, which, as an ethical theory, might quote in its favour both the dictates of immediate feeling and the sanction of public opinion.
FORE:"It wants some time of two o'clock yet," he said. "My friend, Dr. Bruce, does not go to bed early, so I shall go round and look him up. We'll go into the other letters carefully when we have time, Prout, but for the present I should like to borrow this one if you have no objection. What do you say?"
FORE:I will not consume space to explain the converse of this system of inventing, nor attempt to describe how a chance schemer would proceed to hunt after mechanical expedients to accomplish the valve movement in the example given.
FORE:There could be no doubt about that. The label had the same chemist's name on it, with the red caution of "Poison" underneath. The girl put the bottle to her nostrils and noticed the difference in the smell.The simple dread of death, considered as a final annihilation of our existence, remained to be dealt with. There was no part of his philosophy on which Epicurus laid so much stress; he regarded it as setting the seal on those convictions, a firm grasp of which was essential to the security of human happiness. Nothing else seemed difficult, if once the worst enemy of our tranquillity had been overcome. His argument is summed up in the concise formula: when we are, death is not; when death is, we are not; therefore death is nothing to us.175 The pleasures of life will be no loss, for we shall not feel the want of them. The sorrow of our dearest friends will be indifferent to us in the absence of all consciousness90 whatever. To the consideration that, however calmly we may face our own annihilation, the loss of those whom we love remains as terrible as ever, Lucretius replies that we need not mourn for them, since they do not feel any pain at their own extinction.176
FORE:On the whole, this would be by far the best thing to do. It was just possible that her fascinations might elicit something further from Prout. Leona Lalage might not have felt quite so easy in her mind had she known that the little snake-headed detective was fresh from a long interview with Lawrence.The grounds were large and secluded; there were plenty of spots there for lovers. They might have been far away in the country.
FORE:"'4. With regard to the arms of the German soldiers, it is true that the wounded men had none with them, but I have distinctly stated that the crowd consisted of soldiers who belonged to the lightly wounded and of soldiers belonging to the Landen garrison. These latter had been told off to guard the station and the platforms and maintain order. It is possible that they had also to prevent the wounded from moving about on the platforms, but in that case they did not stick to their task, because everybody was free to go where he liked, and I myself did the same. That these guards did not guard anything at all at the moment is proved by the fact that the above-mentioned civilian was able to come near the riot, although he had to pass a number of platforms. That the soldiers belonged to the Landen garrison229 and had to do sentry-go is proved by the fact that they had their bayonets on their rifles.A common angular-pointed drill is capable of withstanding a greater amount of strain upon its edges, and rougher use than any other cutting implement employed in machine fitting. The rigid support which the edges receive, and the tendency to press them to the centre, instead of to tear them away as with other tools, allows drills to be used when they are imperfectly shaped, improperly tempered, and even when the cutting edges are of unequal length.
FORE:Steady, all! Engines quit and left us with a dead stick! No danger.Rapping plates, draw-irons, and other details of pattern-making are soon understood by observation. Perhaps the most useful suggestion which can be given in reference to draw-irons is to say they should be set on the under or bottom side of patterns, instead of on the top, where they are generally placed. A draw-plate set in this way, with a hole bored through the pattern so as to insert draw-irons from the top, cannot pull off, which it is apt to do if set on the top side. Every pattern no matter how small, should be ironed, unless it is some trifling piece, with dowel-pins, draw and rapping plates. If a system of draw-irons is not rigidly carried out, moulders will not trouble themselves to take care of patterns.
FORE:"And he is perfectly right. That wonderful man always is right. Mamie is the only child of a sister of mine who lives in Florence. I wanted her once to impoverish herself to help me in one of my schemes, and she refused. By way of revenge I had her child stolen. That is some four years ago. She never knew I had a hand in it; she deems Mamie to be dead. When I am gone I want you to write to my sister and tell her what I am saying. Only you must get the address."
FORE:
FORE:Help youhelp you with what?For a moment he gave way to emotion. He hesitated for a few seconds, and I saw tears in his eyes. He then went on with a trembling voice:
TWO:They heard the strange, hollow sound again, seeming to come from the metal wall, but impossible to locate at once because of the echo.When we next hear of Aristotle he is at the Macedonian285 Court,174 acting as tutor to Alexander, the future conqueror of Asia, who remained under his charge between the ages of thirteen and sixteen years. The philosopher is more likely to have obtained this appointment by Court interesthis father was Court-physician to Alexanders grandfather, Amyntasthan by his reputation, which could hardly have been made until several years afterwards. Much has been made of a connexion which, although it did not last very long, appeals strongly to the imagination, and opens a large field for surmise. The greatest speculative and the greatest practical genius of that agesome might say of all agescould not, one would think, come into such close contact without leaving a deep impression on each other. Accordingly, the philosopher is supposed to have prepared the hero for his future destinies. Milton has told us how Aristotle bred great Alexander to subdue the world. Hegel tells us that this was done by giving him the consciousness of himself, the full assurance of his own powers; for which purpose, it seems, the infinite daring of thought was required; and he observes that the result is a refutation of the silly talk about the practical inutility of philosophy.175 It would be unfortunate if philosophy had no better testimonial to show for herself than the character of Alexander. It is not the least merit of Grotes History to have brought out in full relief the savage traits by which his conduct was marked from first to last. Arrogant, drunken, cruel, vindictive, and grossly superstitious, he united the vices of a Highland chieftain to the frenzy of an Oriental despot. No man ever stood further from the gravity, the gentleness, the moderationin a word, the S?phrosyn of a true Hellenic hero. The time came when Aristotle himself would have run the most imminent personal risk had he been within the tyrants immediate grasp. His286 nephew, Callisthenes, had incurred deep displeasure by protesting against the servile adulation, or rather idolatry, which Alexander exacted from his attendants. A charge of conspiracy was trumped up against him, and even the exculpatory evidence, taken under torture, of his alleged accomplices did not save him. I will punish the sophist, wrote Alexander, and those who sent him out. It was understood that his old tutor was included in the threat. Fortunately, as Grote observes, Aristotle was not at Ecbatana but at Athens; he therefore escaped the fate of Callisthenes, who suffered death in circumstances, according to some accounts, of great atrocity.
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TWO:"Horrible!" I sighed. "Have they not yet hit the bridge?"
Our account of Neo-Platonism has, with the exception of a few illustrations, been derived exclusively from the earlier essays of Plotinus. His subsequent writings are exceedingly obscure and tedious, and they add little by way either of development or defence to the outlines which he had sketched with a masters hand. Whatever materials they may supply for a better appreciation, whether of his philosophy or of his general character as a thinker, will most profitably find their place in the final survey of both which we shall now attempt to give.Butwhat? demanded Dick.If it were not for securing vent for gas, moulds could be made from plastic material so as to produce fine castings with clear sharp outlines.Righted, Sandy exultantly screeched at the maneuver.Lawrence gave the necessary information. He was a little surprised to hear that his hostess had never heard of the tuberose. Nor, fond of flowers as she seemed, did she appear in the least interested.
TWO:
