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ENGLISH aphrodite²¨¶àBoring, as distinguished from drilling, consists in turning out annular holes to true dimensions, while the term drilling is applied to perforating or sinking holes in solid material. In boring, tools are guided by axial support independent of the [137] bearing of their edges on the material, while in drilling, the cutting edges are guided and supported mainly from their contact with and bearing on the material drilled.Netherland soldiers and inhabitants of the village bustled about along the opposite river-bank. I shouted as loudly as possible; and when at last I succeeded in drawing their attention, I made them understand that I wanted to be pulled across in the little boat, which in ordinary times served as a ferry. A short consultation took place now on the opposite side, after which a soldier, who clearly possessed a strong voice, came as near as possible to the waterside and, making a trumpet of his two hands, roared:A true movement of carriages is dependent upon the amount or wearing power of their bearing surface, how this surface is disposed in reference to the strain to be resisted, and the conditions under which the sliding surfaces move; that is, how kept in contact. The cutting strain which is to be mainly considered, falls usually at an angle of thirty to forty degrees downward toward the front, from the centre of the lathe. To resist such strain a flat top shear presents no surface at right angles to the strain; the bearings are all oblique, and not only this, but all horizontal strain falls on one side of the shear only; for this reason, flat top shears have to be made much heavier than would be required if the sum of their cross section could be employed to resist transverse strain. This difficulty can, however, be mainly obviated by numerous cross girts, which will be found in most lathe frames having flat tops.

Besides the machine tools named, there are special machines to be found in most works, machines directed to the performance of certain work; by a particular adaptation such machines are rendered more effective, but they are by such adaptation unfitted for general purposes."It will cost a great many men!"But he did not take any notice of all my exhortations and was entirely impervious to them in his grief. So I went to the station side by side with the weeping man, and surrounded by the six soldiers. The crackle of the flames, the sound of collapsing houses seemed more terrifying in the night than in day-time, and now and again I got a shock when suddenly, by the uncertain light of the flames, I saw the corpse of a civilian lying in the dark shade of the tall trees on the Boulevard.

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To avenge this alleged shooting by civilians the fires had been kindled in the houses, maxims placed in the streets, women and children beaten, men imprisoned or murdered.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.

The next morning at six I was out and about again. I had not been able to get any breakfast, for the people themselves had nothing. The Germans had called at all the hotels and shops requisitioning everything in stock to feed the thousands who had invaded Lige like so many locusts. The inhabitants practically starved during those days, and carefully saved up bits of bread already as hard as bricks. It was a good thing that the night before I had eaten something at the nunnery, for although at a shop I offered first one, and later on two francs for a piece of bread, I could not get any.In multiplying the variations of a measuring implement by mechanism, it is obvious that movable joints must be employed; it is also obvious that no positive joint, whether cylindrical or flat, could be so accurately fitted as to transmit such slight movement as occurs in gauging or measuring. This difficulty is in most measuring instruments overcome by employing a principle not before alluded to, but common in many machines, that of elastic [151] compensation.An engine lathe is for many reasons called the master tool in machine fitting. It is not only the leading tool so far as performing a greater share of the work; but an engine lathe as an organised machine combines, perhaps, a greater number of useful and important functions, than any machine which has ever been [122] devised. A lathe may be employed to turn, bore, drill, mill, or cut screws, and with a strong screw-feed may be employed to some extent for planing; what is still more strange, notwithstanding these various functions, a lathe is comparatively a simple machine without complication or perishable parts, and requires no considerable change in adapting it to the various purposes named.

CHAPTER XI. SHAFTS FOR TRANSMITTING POWER.

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He showed the most profound indignation, and offered his apologies with lively gestures. He said that my papers proved quite clearly that I was a Netherland journalist. He declined to allow any further examination, and gave the peremptory order that everything that had been taken away from me should be returned at once. When I had put everything in my pockets, he asked:My little protge was, however, soon very tired and complained that her feet ached. I had to carry her for nearly a mile and a half before we arrived at the Netherland Custom House, where I left her behind, as she was now safe. I went on to Maastricht alone, wired to my paper, and then saw the worried, but soon extremely happy parents of the little girl. They went at once to the Netherland frontier to take their child home.Shaping machines are divided into two classes, one modification with a lateral feed of the tools and cutter bar, technically called "travelling head machines," the other class with a feed motion of the table which supports the work, called table-feeding machines. The first modification is adapted for long pieces to be planed transversely, such as toothed racks, connecting rods, and similar work; the second class to shorter pieces where much hand adjustment is required.

To conclude. The reader will understand that the difficulties and diversity of practice, in any branch of engineering, create similar or equal difficulties in explaining or reasoning about the operations; and the most that can be done in the limited space allotted here to the subject of moving material, is to point out some of the principles that should govern the construction and adaptation of handling machinery, from which the reader can take up the subject upon his own account, and follow it through the various examples that may come under notice.

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