A proof of this last proposition is found in the fact that a thorough latheman will perform nearly as much work and do it as well on an old English lathe with plain screw feed, as can be performed on the more complicated lathes of modern construction; but as economy of skill is sometimes an equal or greater object than a saving of manual labour, estimates of tool capacity should be made accordingly. The main points of a lathe, such as may most readily affect its performance, are firsttruth in the bearings of the running spindle which communicates a duplicate of its shape to pieces that are turned,second, coincidence between the line of the spindle and the movement of the carriage,third, a cross feed of the tool at a true right angle to the spindle and carriage movement,fourth, durability of wearing surfaces, especially the spindle bearings and sliding ways. To these may be added many other points, such as the truth of feeding screws, rigidity of frames, and so on, but such requirements are obvious."I'm on the scent," Lawrence laughed. "All the same, if I am correct it will be no laughing matter for somebody before long."Leona Lalage laughed aloud. The touch of those cool fingers thrilled her. To go away now, to abandon it all just when----. Ah, the thing was impossible. She might just as well have cast herself off Waterloo Bridge.
ONE:CHAPTER XXXI. PLANING OR RECIPROCATING MACHINES.
TWO:"Yes, all right, you may go, but we only want you to tell us what you know of this man."Next in order are strains. As the cutting action is the source of strains, and as the resistance offered by the cutting tools is as the length or width of the edges, it will be found in the present case that while other conditions thus far have pointed to small proportions, there is now a new one which calls for large proportions. In displacing the metal between teeth of three-quarters of an inch pitch, the cutting edge or the amount of surface acted upon is equal to a width of one inch and a half. It is true, the displacement may be small at each cut, but the strain is rather to be based upon the breadth of the acting edge than the actual displacement of metal, and we find here strains equal to the average duty of a large planing machine. This strain radiates from the cutting point as from a centre, falling on the supports of the work with a tendency to force it from the framing. Between the rack and the crank-shaft bearing, through the medium of the tool, cutter bar, connection, and crank pin, and in various directions and degrees, this strain may be followed by means of a simple diagram. Besides this cutting strain, there are none of importance; the tension of the belt, the side thrust in bearings, the strain from the angular thrust of the crank, and the end thrust of the tool, although not to be lost sight of, need not have much to do with problems of strength, proportion, and arrangement.
TWO:Mamie clapped her hands again. A significant look passed between the two conspirators. A small key changed hands. Before the story proper was finished Countess Lalage came down the steps into the garden. Admiration was necessary to her, and the idea of a man's preferring Mamie's conversation to hers was absurd.
TWO:The arrangement of patterns with reference to having certain parts of castings solid and clean is an important matter, yet one that is comparatively easy to understand. Supposing the iron in a mould to be in a melted state, and to contain, as it always must, loose sand and 'scruff,' and that the weight of the dirt is to melted iron as the weight of cork is to water, it is easy to see where this dirt would lodge, and where it would be found in the castings. The top of a mould or cope, as it is called, contains the dirt, while the bottom or drag side is generally clean and sound: the rule is to arrange patterns so that the surfaces to be finished will come on the bottom or drag side.
The steam-engine, in the sense in which the term is employed, means not only steam-using machinery, but steam-generating machinery or plant; it includes the engine proper, with the boiler, mechanism for feeding water to the boiler, machinery for governing speed, indicators, and other details.The celebrated Cartesian paradox, that animals are unconscious automata, is another consequence of the same principle. In Aristotles philosophy, the doctrine of potentiality developing itself into act through a series of ascending manifestations, supplied a link connecting the highest rational392 with the lowest vegetal life. The identification of Form with pure thought put an end to the conception of any such intermediate gradations. Brutes must either have a mind like ours or none at all. The former alternative was not even taken into consideration; probably, among other reasons, because it was not easily reconcilable with Christianity; so that nothing remained but to deny sensibility where thought was believed not to exist."I fancy I can see my way to settle this business," he said. "In my early days I saw a deal of the shady side of finance--as a lad I was in the office of one of the very worst of them. I know all about this fellow. He is going to climb down, he is going to take a reasonable rate of interest, and he is going to give your lover time. You can make your mind easy about that."
荣誉榜
THREE:A document purporting to be Aristotles will has been preserved by Diogenes Laertius, and although some objections to its authenticity have been raised by Sir A. Grant, they have, in our opinion, been successfully rebutted by Zeller.180 The philosophers testamentary dispositions give one more proof of his thoughtful consideration for the welfare of those about him, and his devotion to the memory of departed friends. Careful provision is made for the guardianship of his youthful children, and for the comfort of his second wife, Herpyllis, who, he says, had been good to him. Certain slaves, specified by name, are to be emancipated, and to receive legacies. None of the young slaves who waited on him are to be sold, and on growing up they are to be set free if they deserve it. The bones of his first wife, Pythias, are, as she herself desired, to be laid by his. Monuments are to be erected in memory of his mother, and of certain friends, particularly Proxenus, who had been Aristotles guardian, and his family.
THREE:Hardly more than two hundred feet behind, they felt the cold, clammy fingers of the cloud touch their shrinking faces.
