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As a means for transmitting power, shafts afford the very important advantage that power can be easily taken off at any point throughout their length, by means of pulleys or gearing, also in forming a positive connection between the motive-power and machines, or between the different parts of machines. The capacity of shafts in resisting torsional strain is as [46] the cube of their diameter, and the amount of torsional deflection in shafts is as their length. The torsional capacity being based upon the diameter, often leads to the construction of what may be termed diminishing shafts, lines in which the diameter of the several sections are diminished as the distance from the driving power increases, and as the duty to be performed becomes less. This plan of arranging line shafting has been and is yet quite common, but certainly was never arrived at by careful observation. Almost every plan of construction has both advantages and disadvantages, and the best means of determining the excess of either, in any case, is to first arrive at all the conditions as near as possible, then form a "trial balance," putting the advantages on one side and the disadvantages on the other, and footing up the sums for comparison. Dealing with this matter of shafts of uniform diameter and shafts of varying diameter in this way, there may be found in favour of the latter plan a little saving of material and a slight reduction of friction as advantages. The saving of material relates only to first cost, because the expense of fitting is greater in constructing shafts when the diameters of the different pieces vary; the friction, considering that the same velocity throughout must be assumed, is scarcely worth estimating.

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I roamed about aimlessly in a scorching heat. Whither? I did not know myself. I did not know Louvain and met nobody whom I might ask something. I came near a couple of streets that were only ruins; the walls collapsed against each other and filled the roadway with rubbish, so that sometimes I could not see whether I walked on or beside the place where the houses used to stand.
THREE:Looktoward shore! screamed Sandy.
FORE:Ren checked himself. He grew suddenly calm, but the effort threw him into a violent perspiration. Well, his time should come yet.
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FORE:Prout tapped the pile of papers significantly."Why, it could not logically have been otherwise. Would you have produced those notes above all others if they had not been the last you possessed?"

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FORE:

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FORE:"Oh yes, it has been destroyed already a couple of times, but we shall teach them a lesson! Why did not the Belgians allow us to pass through their country? What can their little army do against us? As soon as a sufficient number have crossed we shall go for these forts, then on to Brussels, and within a fortnight we shall be in Paris. Lige we have taken already."

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THREE:CHAPTER XVII. THE GAMBLERS.The work to be performed consists in cutting away the metal between the teeth of a rack, leaving a perfect outline for the teeth; and as the shape of teeth cannot well be obtained by an adjustment of tools, it must be accomplished by the shape of the tools. The shape of the tools must, therefore, be constantly maintained, [155] and as the cross section of the displaced metal is not too great, it may be assumed that the shape of the tools should be a profile of the whole space between two teeth, and such a space be cut away at one setting or one operation. By the application of certain rules laid down in a former place in reference to cutting various kinds of material, reciprocating or planing tools may be chosen instead of rotary or milling tools.
  • FORE:When I told the doctor that I had to go to the station, he explained to me how I could get there without walking across red hot cinders, and I followed his advice. I walked through quarters which used to be the pride of the city, but were now turned into heaps of rubbish.One need only compare the catalogue of particular histories subjoined to the Parasceve,538 with a table of Aristotles works, to understand how closely Bacon follows in the footsteps of his predecessor. We do, indeed, find sundry subjects enumerated on which the elder student had not touched; but they are only such as would naturally suggest themselves to a man of comprehensive intelligence, coming nearly two thousand years after his original; while they are mostly of no philosophical value whatever. Bacons merit was to bring the distinction between the descriptive sciences and the theoretical sciences into clearer consciousness, and to give a view of the former corresponding in completeness to that already obtained of the latter.

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    FORE:Behind it was a black motor and the form of Balmayne.

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    FORE:"My dearest girl, what is the matter?" he asked.

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THREE:"It can't be as bad as my news," Leona said, gloomily. "They have traced the rest of the missing notes directly to my possession."Lawrence nodded approvingly. Bruce had struck the right note.

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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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THREE:Cutting tools include nearly all that are employed in finishing; lathes, planing machines, drilling and boring machines, shaping, slotting and milling machines, come within this class. The machines named make up what are called standard tools, such [120]as are essential and are employed in all establishments where general machine manufacture is carried on. Such machines are constructed upon principles substantially the same in all countries, and have settled into a tolerably uniform arrangement of movements and parts.

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[16]"Ah, then, you must dissemble with her. Tell her any lie you like so long as you let Dr. Bruce alone. I guessed there was some scheme on hand when I heard that you had written to the Doctor. Goodbye, Wolffman, and recollect that your ruin or otherwise depends upon yourself."Writers on mechanical subjects, as a rule, have only theoretical knowledge, and consequently seldom deal with workshop processes. Practical engineers who have passed through a successful experience and gained that knowledge which is most difficult for apprentices to acquire, have generally neither inclination nor incentives to write books. The changes in manipulation are so frequent, and the operations so diversified, that practical men have a dread of the criticisms which such changes and the differences of opinion may bring forth; to this may be added, that to become a practical mechanical engineer consumes too great a share of one's life to leave time for other qualifications required in preparing books. For these reasons "manipulation" has been neglected, and for the same reasons must be imperfectly treated here. The purpose is not so much to instruct in shop processes as to point out how they can be best learned, the reader for the most part exercising his own judgment and reasoning powers. It will be attempted to point out how each simple operation is governed by some general principle, and how from such operations, by tracing out the principle which lies at the bottom, it is possible to deduce logical conclusions as to what is right or wrong, expedient or inexpedient. In this way, it is thought, can [6] be established a closer connection between theory and practice, and a learner be brought to realise that he has only his reasoning powers to rely on; that formul?, rules, tables, and even books, are only aids to this reasoning power, which alone can master and combine the symbol and the substance.
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