2021-04-17 10:19:53

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ENGLISH In handling a weight with the hands it is carefully raised, and laid down with care, but moved as rapidly as possible throughout the intervening distance; this lesson of nature has not been disregarded. We find that the attention of engineers has been directed to this principle of variable speed to be controlled at will. The hydraulic cranes of Sir William Armstrong, for example, employ this principle in the most effective manner, not only securing rapid transit of loads when lifted, but depositing or adjusting them with a care and precision unknown to mechanism positively geared or even operated by friction brakes.

On this side hundreds of soldiers were standing; they had taken off their uniforms in the fierce heat, and were busy loading and unloading and changing horses. From time to time the entire scene was hidden by the smoke from numerous burning houses at Lixhe, quite near the river. I walked in the most casual way, in an unconcerned attitude, looked calmly at some of the houses I passed, and which were for the greater part destroyed. The walls were pierced by bullets, the rooms generally burnt out; in the front gardens lay all sorts of furniture, dragged out of the house and then smashed to pieces.Inventions in machine improvement, no matter what their nature, must of course consist in and conform to certain fixed modes of operating, and no plan of urging the truth of a proposition is so common, even with a chance inventor, as to trace out the 'principles' which govern his discovery.I stood near the spot where the ferry-boat used to take people across; but to cross was now out of the question, for any one alighting on the opposite side would be landed in the scorching glare. Therefore, I returned to Lixhe, where I might try to cross the river by the pontoon-bridge, and get to Vis along the other bank of the Meuse.

"In the circumstances in which we are placed it is necessary to retain the greatest possible tranquillity and calm.And by my side stood officers and soldiers raging and cursing. To them came the returning men, blood running along their faces from insignificant wounds, and they bawled and bellowed, and thundered with a thousand curses that they wanted to go back and try again. How ghastly they rolled their eyes in frenzied excitement! Some pointing at me asked the officer who I was, and he explained. Then I had to listen to endless imprecations against the civilian population of Belgium, who, according to them, consisted entirely of francs-tireurs, who all of them deserved to be shot, and to have their61 houses burned down. To repeat the coarse words which they sputtered out in their rage would only cause disgust.

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As Professor Noyons heard that other hospitals, churches, and ancient buildings were not spared either, he went to the commanding officer through the rain of bullets, clad in his white overalls, to claim protection for everything that lawfully displayed the Red Cross flag, and to request that churches, convents, ancient buildings, and especially the town-hall should be spared. It is only owing to his intervention that not much more was destroyed in Louvain.There was a continuous coming and going at the bridge-command, for when I left the shrubberies a great many soldiers of high and low rank, with portfolios and documents, were waiting outside. The soldiers were to escort me back across the bridge, so that I might go on to Vis along the other bank.

4. Proportions of the various parts, including the framing, bearing surfaces, shafts, belts, gearing, and other details.Among exceptions to the ordinary plans of constructing trip-hammers, may be mentioned those employed in the American Armoury at Springfield, U.S., where small hammers with rigid frames and helves, the latter thirty inches long, forged from Lowmoor iron, are run at a speed of 'six hundred blows a minute.' As an example, however, they prove the necessity for elasticity, because the helves and other parts have to be often renewed, although the duty performed is very light, such as making small screws.

Arrangement comes next; in this the first matter to be considered is convenience of manipulation. The cutting position should be so arranged as to admit of an easy inspection of the work. An operator having to keep his hand on the adjusting or feed mechanism, which is about twelve inches above the work, it follows that if the cutting level is four feet from the floor, and the feed handle five feet from the floor, the arrangement will be convenient for a standing position. As the work requires continual inspection and hand adjustments, it will for this reason be a proper arrangement to overhang both the supports for the rack and the cutting tools, placing them, as we may say, outside the machine, to secure convenience of access and to allow of inspection. [156] The position of the cutting bar, crank, connections, gearing, pulleys, and shafts, will assume their respective places from obvious conditions, mainly from the position of the operator and the work.The fitting or finishing department of engineering establishments is generally regarded as the main one.The third plan of boring with bars resting in bearings is more extensively practised, and has the largest range of adaptation. A feature of this plan of boring is that the form of the boring-bar, or any imperfection in its bearings, is communicated to the work; a want of straightness in the bar makes tapering holes. This, of course, applies to cases where a bar is fed through fixed bearings placed at one or both ends of a hole to be bored. If a boring-bar is bent, or out of truth between its bearings, the diameter of the hole being governed by the extreme sweep of the cutters is untrue to the same extent, because as the cutters move along and come nearer to the bearings, the bar runs with more truth, forming a tapering hole diminishing toward the rests or bearings. The same rule applies to some extent in chuck-boring, the form of the lathe spindle being communicated to holes bored; but lathe spindles are presumed to be quite perfect compared with boring bars.

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"And how are they thanked for it?"10. Falloise, alderman.

After taking warm leave of the Head of St. Hadelin College, I continued my walk to the Netherland frontier.

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Apr-17 10:19:53