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4. To cause a movement of the valve after the hammer stops there must be an intermediate agent, that will continue to [163] act after the movement of the hammer drop has ceased.But Jeff held a level course. He had to, in order to maintain the advantage of speed. He thought he could get alongside their quarry before the mist swallowed it, hid it, ended the pursuit.Already Larry had his coat and shoes off. Stripping them off, and with no one to observe, removing all his clothes, he lowered himself onto a pontoon and thence to the water, chilly but not too cold on the hot June afternoon.
THREE:"It's like this," he said, laying the fateful notes on the table. "A man who has got to be identified is found dead--murdered, beyond a doubt, in an unoccupied house in Raven Street. All the circumstances of the case point to robbery. On searching the body we find a letter written by the deceased to a friend saying that he is forwarding some banknotes. He gives the number of those banknotes amongst others--numbers 190753 to 190793. All this is set out clearly in the letter. Now, will you please to examine those notes, doctor, and tell me the numbers?"
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TWO:An apprentice should never ask questions about simple and obvious matters, or about such things as he can easily learn by his own efforts. The more difficult a question is, the more pleasure a skilled man will take in answering it. In short, a learner should carefully consider questions before asking them. A good plan is to write them down, and when information is wanted about casting, never go to a foundry to interrupt a manager or moulder at melting time, nor in the morning, when no one wants to be annoyed with questions.
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TWO:Planing machines of the most improved construction are driven by two belts instead of one, and many mechanical expedients have been adopted to move the belts differentially, so that both should not be on the driving pulley at the same time, but move one before the other in alternate order. This is easily attained by simply arranging the two belts with the distance between them equal to one and one-half or one and three-fourth times the width of the driving pulley. The effect is the same as that accomplished by differential shifting gearing, with the advantage of permitting an adjustment of the relative movement of the belts.Not a single person was seen on the road, and everything went well until we got to the village of Veldwezelt. Suddenly, quite unexpectedly, a violent rifle fire and a continued whistling of bullets was heard from the neighbourhood of a house close by. Although the soldiers later on asserted to the contrary, I was sure that the firing did not come from the house, but from some underwood near by.
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ONE:"Will you be so good as to tell me how?" Balmayne said.
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TWO:Modern turbine wheels have been the subject of the most careful investigation by able engineers, and there is no lack of mathematical data to be referred to and studied after the general principles are understood. The subject, as said, is one of great complicity if followed to detail, and perhaps less useful to a mechanical engineer who does not intend to confine his practice to water-wheels, than other subjects that may be studied with greater advantage. The subject of water-wheels may, indeed, be called an exhausted one that can promise but little return for labour spent upon itwith a view to improvements, at least. The efforts of the ablest hydraulic engineers have not added much to the percentage of useful effect realised by turbine wheels during many years past.And leaves us with Plotinus and pure souls.



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< 219Presuming 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."I should like to know what you make of them," said Lawrence.But the mystery had hardly begun!(1.) What should determine the social rank of industrial callings?(2.) Why have the physical sciences and mechanic arts achieved so honourable a position?(3.) How may the general object of the engineering arts be described?(4.) What is the difference between science and art as the terms are generally employed in connection with practical industry?
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