The division of labour, that system upon which we may say our great industrial interests are founded, is in machine fitting promoted in a wonderful degree by the use of gauging implements. If standard dimensions can be maintained, it is easy to see that the parts of a machine can be constructed by different workmen, or in different shops, and these parts when assembled all fit together, without that tedious and uncertain plan of try-fitting which was once generally practised. There are, it is true, certain kinds of fitting which cannot well be performed by gauges; moving flat surfaces, such as the bearings of lathe slides or the faces of steam engine valves, are sooner and better fitted by trying them together and scraping off the points of contact; but even in such cases the character of the work will be improved, if one or both surfaces have been first levelled by gauging or surface plates.
FORE:"Well, we shall hear more of that lustreless black motor later on when I come to go closely into the mystery and show the police what asses they are. You address a question to the driver and he turns out to be dumb. He takes you to the corner house, where you are received by a fair woman with a mantilla over her head so that you have the very vaguest idea of her features. If you were asked to swear to her identity you couldn't do it I suppose?"The author of the Leviathan has sometimes been represented as one who carried the Baconian method into politics, and prepared the way for its more thorough application to psychology by Locke. But this view, which regards the three great leaders of English philosophy in the seventeenth century as successive links in a connected series, is a misapprehension of history, which could only have arisen through leaving out of account the contemporary development of Continental speculation, and through the inveterate habit of looking on the modern distinction between empiricism and transcendentalism as a fundamental antithesis dividing the philosophers of every epoch into two opposing schools. The truth is that, if the three writers just mentioned agree in deriving knowledge solely from experience, they agree in nothing else; and that their unanimity on this one point does not amount to much, will be evident if we consider what each understood by the notion in question.
"Latest society scandal!" came the shrill voices. "Latest society sensation! Flight of the Countess Lalage!"For set squares, or triangles, as they are sometimes called, no material is so good as ebonite; such squares are hard, smooth, impervious to moisture, and contrast with the paper in colour; besides they wear longer than those made of wood. For instruments, it is best to avoid everything of an elaborate or fancy kind; such sets are for amateurs, not engineers. It is best to procure only such instruments at first as are really required, of the best quality, and then to add others as necessity may demand; in this way, experience will often suggest modifications of size or arrangement that will add to the convenience of a set.The second plan of boring by means of a bar mounted on points or centres is one by which the greatest accuracy is attainable; it is like chuck-boring a lathe operation, and [138] one for which no better machine than a lathe has been devised, at least for the smaller kinds of work. It is a problem whether in ordinary machine fitting there is not a gain by performing all boring in this manner whenever the rigidity of boring bars is sufficient without auxiliary supports, and when the bars can pass through the work. Machines arranged for this kind of boring can be employed in turning or boring as occasion may require.
