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ENGLISH ²Ô¾®¸è PREFACEAfter reaching the main road they turned to the right towards Vis, probably in order to try to cross the Meuse near Lixhe and then proceed to Tongres along the above-mentioned road. It would not be an easy undertaking, for the forts refused to keep silent, and already many a wounded man was carried on a comrade's horse."Des ouvriers volontaires seront embauchs partir du 21 Ao?t sur la rive gauche de la Meuse, où on fera conna?tre les conditions dtailles":
"You are a journalist?"In the use of hydraulic apparatus for transmitting and applying power, there is, however, this difficulty to be contended with: water is inelastic, and for the performance of irregular duty, there is a loss of power equal to the difference between the duty that a piston may perform and what it does perform; that is, the amount of water, and consequently the amount of power given off, is as the movement and volume of the water, instead of as the work done. The application of hydraulic machinery to the lifting and handling of weights will be further noticed in another place.Two facts are made clear by Mr. Mokveld's book, if, indeed, the world has ever doubted them. The first is that the German authorities, believing their victory to be beyond question, deliberately sanctioned a campaign of frightfulness. They did not imagine that they would ever be held to account. They wished to terrorise their opponents by showing them what resistance involved. The atrocities were not the blunders of drink-sodden reservists, but the result of the theories of half-witted military pedants. The second is that the invading armies were as nervous as a hysterical woman. Those would-be conquerors of the world were frightened by their own shadows. A shot fired by accident from a German rifle led to tales of attacks by Belgian francs-tireurs and then to indiscriminate murder by way of revenge. Mr. Mokveld examined the legends of treacherous Belgian assaults and the 7 mutilation of the German wounded, and found them in every case wholly baseless. No German had ever seen these things happen, but had only heard of them. When definite details were given, Mr. Mokveld tracked them down and found them false. The Belgian atrocities lacked even that slender justification which belongs to reprisals. They were the work of a drunken and "rattled" soldieryfor fear is apt to make men brutaldeliberately encouraged by the authorities, who for this purpose relaxed the bonds of military discipline. When the battle of the Marne changed the complexion of affairs, these authorities grew scared and repudiated the policy, but Belgium remains a witness of what Germany's triumph means for her victims.
No little astonishment was therefore created by an interview which I published with Dr. van der Goot of The Hague, who did so much excellent work in the Red Cross Hospital at Maastricht. He also had come to believe all these stories, and as everybody always mentioned a large hospital in Aix-la-Chapelle, which was said to be full of similarly mutilated soldiers, Dr. van der Goot went to that91 town to see for himself. The chief medical officer of that hospital in a conversation stated that not one single case of that sort had been treated in his institution nor in any of the other local hospitals where he was a visiting physician. At a meeting of the medical circle just lately held he had not heard one word, nor had any one colleague, about the treatment of similar cases."3. That everything that may appear hostile to the German army must be avoided with the utmost care.2. The speed at which the transmitting machinery must move.
Air seems to be the most natural and available medium for transmitting and distributing power upon any general system like water or gas, and there is every probability of such a system existing at some future time. The power given out by the expansion of air is not equal to the power consumed in compressing it, but the loss is but insignificant compared with the advantages that may be gained in other ways. There is no subject more interesting, and perhaps few more important for an engineering student to study at this time, than the transmission of power and the transport of material by pneumatic apparatus.Artistic drawing is addressed to the senses, geometrical drawing is addressed to the understanding. Geometrical drawing may, however, include artistic skill not in the way of ornamentation, but to convey an impression of neatness and completeness, that has by common custom been assumed among engineers, and which conveys to the mind an idea of competent construction in the drawing itself, as well as of the machinery which is represented. Artistic effect, so far as admissible in mechanical drawing, is easy to learn, and should be understood, yet through a desire to make pictures, a beginner is often led to neglect that which is more important in the way of accuracy and arrangement.
The effect of tempering baths is as their conducting power; chemicals except as they may contribute to the conducting properties of a bath, may safely be disregarded. For baths, cold or ice water loaded with salt for extreme hardness, and warm oil for tools that are thin and do not require to be very hard, are the two extremes outside of which nothing is required in ordinary practice.As darkness was coming on I asked him whether it was not dangerous to pass the night in the house of that little old man, whom I mentioned above. He saw nothing dangerous in it, as by far the greater part of the town was deserted, and no attack need be feared."Well, it seems that the civilians cannot understand that only soldiers may fight soldiers, and for that reason the whole place has been set on fire."
In regard to the use of the T square and set squares, no useful rules can be given except to observe others, and experiment until convenient customs are attained. A beginner should be careful of adopting unusual plans, and above all things, of making important discoveries as to new plans of using instruments, assuming that common practice is all wrong, and that it is left for him to develop the true and proper way of drawing. This is a kind of discovery which is very apt to intrude itself at the beginning of an apprentice's course in many matters besides drawing, and often leads him to do and say many things which he will afterwards wish to recall.Castings are of course sprung by the action of unequal strains, caused by one part cooling or 'setting' sooner than another. That far all is clear, but the next step takes us into the dark. What are the various conditions which induce irregular cooling, and how is it to be avoided?"To the inhabitants.
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There was not much traffic. Only here and there stood some German soldiers, or seriously wounded men were lying on mattresses and chairs. Nearly every house by the roadside had been turned into an emergency hospital, for from all sides they brought in soldiers wounded by shells that had exploded amidst the advancing divisions.My poor informants had not yet made up their mind where to go, fearing that they might not be permitted to enter The Netherlands as they were without means of subsistence. I assured them, however, that our conception of neighbourly love and charity was different, and that they would be hospitably received.The principal improvements and changes in machine fitting at the present time is in the application of special tools. A lathe, a planing machine, or drilling machine as a standard machine, must be adapted to a certain range of work, but it is evident that if such tools were specially arranged for either the largest or the smallest pieces that come within their capacity, more work could be performed in a given time and consequently at less expense. It is also evident that machine tools must be kept constantly at work in order to be profitable, and when there are not sufficient pieces of one kind to occupy a machine, it must be employed on various kinds of work; but whenever there are sufficient pieces of the same size upon which certain processes of a uniform character are to be performed, there is a gain by having machines constructed to conform as nearly as possible to the requirements of special work, and without reference to any other.
It is not intended to recommend writing down rules or tables relating to shop manipulation so much as facts which require remark or comment to impress them on the memory; writing notes not only assists in committing the subjects to memory, but cultivates a power of composing technical descriptions, a very necessary part of an engineering education. Specifications for engineering work are a most difficult kind of composition and may be made long, tedious, and irrelevant, or concise and lucid.Cutting, as a process in converting material, includes the force to propel cutting edges, means to guide and control their action, and mechanism to sustain and adjust the material acted upon. In cutting with hand tools, the operator performs the two functions of propelling and guiding the tools with his hands; but in what  is called power operations, machines are made to perform these functions. In nearly all processes machines have supplanted hand labour, and it may be noticed in the history and development of machine tools that much has been lost in too closely imitating hand operations when machines were first applied. To be profitable, machines must either employ more force, guide tools with more accuracy, or move them at greater speed, than is attainable by hand. Increased speed may, although more seldom, be an object in the employment of machinery, as well as the guidance of implements or increased force in propelling them. The hands of workmen are not only limited as to the power that may be exerted, and unable to guide tools with accuracy, but are also limited to a slow rate of movement, so that machines can be employed with great advantage in many operations where neither the force nor guidance of tools are wanting.I pitied him from the bottom of my heart, and tried to console him by remarking that it was all a misunderstanding, and that I would see to it that he would soon be released.
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