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ENGLISH ³åÌïÐÓÀæÃ¨PREFACEThe faces of the dies remain parallel, no matter how large the piece may be that is operated upon, while with a trip-hammer, the top die moves in an arc described from the trunnions of the helve, and the faces of the dies can only be parallel when in one position, or when operating on pieces of a certain depth. This feature of parallel movement with the dies of crank-hammers is of great importance on some kinds of work, and especially so for machine-forgings where the size or depth of the work is continually being varied."But where did you stay then during the night?"
Forging as a process in machine-making includes the forming and shaping of the malleable parts of machinery, welding or joining pieces together, the preparation of implements for forging and finishing, tempering of steel tools, and usually case-hardening."Have they given you back everything?"The terrible thunder of the guns, of both besiegers and besieged, vibrated through the air. In the distance I noticed a couple of men, probably German soldiers, but a pontoon-bridge was nowhere to be seen. After a few minutes, however, I reached a spot where the Meuse makes a short curve, and had scarcely walked round it, when I saw, only a couple of hundred yards away, the bridge in question, across which a long train of vehicles was passing, loaded with victuals, hay, straw, etc.
During the week of my compulsory stay in Louvain I had also the privilege of making the acquaintance of two brave compatriots; I mean Professor Noyons and his wife.As even high officers told me those things, not without some emotion, I began to believe them and wrote something about them to my paper. But what was made clear to me at a later visit! That there was not a word of truth in the whole story of that poisoning; that on that day and in that square no shooting had taken place; that a couple of days before the population had been ordered to leave their houses within two hours without any reason being given; and afterwards several houses had simply been burned down.
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The valve gearing of automatic steam-hammers to fill the two conditions of allowing a dead or an elastic blow, furnishes one of the most interesting examples of mechanical combination.The title of a drawing is a feature that has much to do with its appearance, and the impression conveyed to the mind of an observer. While it can add nothing to the real value of a drawing, it is so easy to make plain letters, that the apprentice is urged to learn this as soon as he begins to draw; not to make fancy letters, nor indeed any kind except plain block letters, which can be rapidly laid out and finished, and consequently employed to a greater extent. By drawing six parallel lines, making five spaces, and then crossing them with equidistant lines, the points and angles in block letters are determined; after a little practice, it becomes the work of but a few minutes to put down a title or other matter on a drawing so that it can be seen and read at a glance in searching for sheets or details.In the case of tools composed partly of iron and partly of steel, steel laid as it is called, the tendency to crack in hardening may be avoided in most cases by hammering the steel edge at a low temperature until it is so expanded that when cooled in hardening it will only contract to a state of rest and correspond to the iron part; the same result may be produced by curving a piece, giving convexity to the steel side before hardening.
"Now, look here, sister, I am a cousin of S?ur...."(1.) Why cannot the regular working drawings of a machine be employed to construct patterns by?(2.) What should determine the quality or durability of patterns?(3.) How can the arrangement of patterns affect certain parts of a casting?(4.) What means can be employed to avoid inherent strain in castings?(5.) Why is the top of a casting less sound than the bottom or drag side?(6.) What are cores employed for?(7.) What is meant by venting a mould?(8.) Explain the difference between green and dry sand mouldings.(9.) Why is sand employed for moulds?(10.) What generally causes the disarrangement of cores in casting?(11.) Why are castings often sprung or crooked?(12.) What should determine the amount of draught given to patterns?(13.) What are the means generally adopted to avoid cooling strains in castings?She looked me up and down suspiciously, and then said:
(1.) Why are shaping machines better adapted than planing machines for planing slots, key-ways, and so on?(2.) What objects are gained by a quick return motion of the cutter bar of shaping machines?Before I got there I passed the Halls of Louvain, the building that contained the world-famous library, with its numerous art-treasures. Only the outer walls were left standing, inside it was all ruins. All was reduced to dust, to miserable rubbish, and never will one single page be recovered of all those thousands of burned manuscripts.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.
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One of the problems connected with the handling of material is to determine where hand-power should stop and motive-power beginwhat conditions will justify the erection of cranes, hoists, or tramways, and what conditions will not. Frequent mistakes are made in the application of power when it is not required, especially for handling material; the too common tendency of the present day being to apply power to every purpose where it is possible, without estimating the actual saving that, may be effected. A common impression is that motive power, wherever applied to supplant hand labour in handling material, produces a gain; but in many cases the  fallacy of this will be apparent, when all the conditions are taken into account.The principles of all mechanism for handling loads should be such as to place the power, the rate of movement, and the direction of the force, within the control of an operator, which, as has been pointed out, is the same thing in effect as the action of the human hands.The officer assured me that a new effort would be made soon, as they were commanded to take Pontisse and Lierce at any price, the seventh and ninth regiment of foot-artillery of Cologne being selected for the purpose.
At the other end of the bridge I was left by my escort, and went on alone; on my left the Meuse, on my right burning houses, above me hissing and whistling shells, that came down in front of me and behind me, with tremendous explosions, throwing the loose earth high into the air.CHAPTER IX. WIND-POWER.The whole evening and the next day the Germans went on shooting people and firing houses. It is worth recording that the library was already set on fire that same evening of the fray on the Naamsche Vest; it was burning at eight o'clock.
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