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ENGLISH Ѹ2kThis brings us back to the old proposition, that for structures which do not involve motion, mathematical data will furnish dimensions; but the same rule will not apply in machinery. To follow the proportions for shafts that would be furnished by pure mathematical data would in nearly all cases lead to error. Experience has demonstrated that for ordinary cases, where power is transmitted and applied with tolerable regularity, a shaft three inches in diameter, making one hundred and fifty revolutions a minute, its bearings three to four diameters in length, and placed ten feet apart, will safely transmit fifty horse-power.Cutting processes may be divided into two classes: cylindrical cutting, as in turning, boring, and drilling, to produce circular forms; and plane cutting, as in planing, shaping, slotting and shearing, to produce plane or rectangular forms. Abrading or grinding processes may be applied to forms of any kind.

Near each staircase stood a blackboard on which the Germans had written that to go upstairs was prohibited under penalty of death. The Head explained that the Germans alleged that light signals had been given from the top storey.I had walked another three miles, when a big crowd of fugitives met me. They seemed to have come a long way, for the majority could hardly walk on, and had taken off their shoes and boots, on account of the scorching heat, going on barefooted in the shade of the tall trees. It was a procession, numbering hundreds of men, women, and children. The aged were supported, the babies carried. Most of them had a small parcel on their back or under their arm. They seemed tired to death, had dark red faces, and betrayed great fear and nervousness. I crossed the road to speak to them, and as soon as they noticed it the whole crowd, numbering hundreds of people, stood still, creeping closer together, women and girls trying hard to hide themselves behind the men, and these doffed their caps timidly.A moment later a gigantic motor-car came racing down at a great speed. Six soldiers stood up in it, their rifles pointed at me. I thought that they36 intended to shoot me and everybody they might meet, but a seventh soldier standing by the side of the chauffeur made a movement with his arms, from which I understood that he wanted me to put my hands up. I did so.

No wonder that the inhabitants were afraid and looked askance at me as they mistook me for a German."The houses caught fire from burning benzine, and the flames burst out in other quarters also. On Wednesday afternoon part of the town and the northern suburb were in flames."The bill-poster replied "yes" or "no" to my questions, whichever answer fitted, and as soon as he had finished his task he hurriedly trotted off. I did not see any other inhabitant.

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"No, I've none to sell."

In order to examine once more the state of affairs around Lige, I decided to pay another visit to that town.In considering pneumatic machinery there are the following points to which attention is directed:

This book does not attempt to give more than evidence of the truth. It does not claim to have14 literary distinction; I have not even tried to give it that stamp. By relating various events successively witnessed, which have no mutual connection, this would be very difficult.The streets leading to the bridge over the Meuse and into the town were also densely thronged with refugees. Here and there large groups listened to the stories told, with profusion of tears, of sufferings inflicted, depicted in far harsher colours than could have been possible. But the wretched creatures exaggerated unconsciously; in their affrighted state they had seen things that had never occurred.In shading drawings, be careful not to use too deep tints, and to put the shades in the right place. Many will contend, and not without good reasons, that working drawings require no shading; yet it will do no harm to learn how and where they can be shaded: it is better to omit the shading from choice than from necessity. Sections must, of course, be shadednot with lines, although I fear to attack so old a custom, yet it is certainly a tedious and useless one: sections with light ink shading of different colours, to indicate the kind of material, are easier to make, and look much better. By the judicious arrangement of a drawing, a large share of it may be in sections, which in almost every case are the best views to work by. The proper colouring of sections gives a good appearance to a drawing, and conveys an idea of an organised machine, or, to use the shop term, "stands out from the paper." In shading sections, leave a margin of white between the tints and the lines on the upper and left-hand sides of the section: this breaks the connection or sameness, and the effect is striking; it separates the parts, [85] and adds greatly to the clearness and general appearance of a drawing.

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I shall never forget that sight. The Meuse separated me from the raging blaze on the opposite bank. The flames roared violently, roofs and rafters and walls crashed down, and the wood of living trees was burning and screeching loudly. I saw but a sea of fire, one glaring glow, and the air was scorchingly hot. A light breeze blew through the place, and made clouds of smoke to whirl through the streets like avalanches of snow. The view down the longer streets leading straight from the hill-tops to the Meuse was very fantastic.

Even before that, on August 11th I sent a communication, by post or cable (De Tijd, No. 20353), in which the following is found:

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