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    Software name: appdown
    Software type: Microsoft Framwork

    size: 137MB

    Lanuage:Englist

    Software instructions

      "That is a Netherland girl, sir, who was staying at her aunt's at Lige ... I mean to say at Vis, and whom I take now with me to Maastricht."In compression processes no material is cut away as in cutting or grinding, the mass being forced into shape by dies or forms that give the required configuration. The action of compressing machines may be either intermittent, as in the case of rolling mills; percussive, as in steam hammers, where a great force acts throughout a limited distance; or gradual and sustained, as in press forging. Machines of application, for abrading or grinding, are constantly coming more into use; their main purpose being to cut or shape material too hard to be acted upon by compression or by cutting processes. It follows that the necessity for machines of this kind is in proportion to the amount of hard material which enters into manufactures; in metal work the employment of hardened steel and iron is rapidly increasing, and as a result, grinding machines have now a place among the standard machine tools of a fitting shop.


      If asked for advice as to the most important object for an apprentice to aim at in beginning his fitting course, nine out of ten experienced men will say, "to do work well." As power is measured by force and velocity, work is measured by the two conditions of skill and time. The first consideration being, how well a thing may be done, and secondly, in how short a time may it be performed; the skill spent on a piece of work is the measure of its worth; if work is badly executed, it makes no difference how short the time of performance has been; this can add nothing to the value of what is done although the expense is diminished.Between Thienen and Louvain I met endless trains of refugees, exactly like those I had seen already near Vis, Lige, and other places. These also carried their wretched bundles, and children and young people did their utmost to encourage and support their elders on their arduous path. All these people saluted me in a cringing, timid manner, nodding smilingly and taking off their caps already from afar.


      5. The lubrication of surfaces working under air pressure, such as the pistons and valves of engines.As soon as the "friendly" Netherlander thought that he had swallowed sufficient praise, I began to ask questions about the meaning of that wanton devastation, and why it was inflicted on the population! Before answering, he looked round in a casual manner, as if thinking: "Oh, it's that bit of fire you refer to!" And then exploded in a string of imprecations against the population.


      The fitting or finishing department of engineering establishments is generally regarded as the main one.

      I came now to the eastern boundary of the town, whence the streets slope gently towards the bank of the Meuse. Here I had an atrociously fantastic view of the burning mass of houses. I fell in with a crowd of dead-drunk soldiers, who first handed my papers on from the one to the other, but as soon as they understood that I was a Netherlander they showed no hostility.

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      Very sleepy, I went on listening ... listening ...112 probably until I fell asleep again, for I cannot remember what happened after.A book containing the pattern record should be kept, in which these catalogue numbers are set down, with a short description to identify the different parts to which the numbers belong, so that all the various details of any machine can at any time be referred to. Besides this description, there should be opposite the catalogue of pattern numbers, ruled spaces, in which to enter the weight of castings, the cost of the pattern, and also the amount of turned, planed, or bored surface on each piece when it is finished, or the time required in fitting, which is the same thing. In this book the assembled parts of each machine should be set down in a separate list, so that orders for castings can be made from the list without other references. This system is the best one known to the writer, and is in substance a plan now adopted in many of the best engineering establishments. A complete system in all things pertaining to drawings and classifications should be rigidly adhered to; any plan is better than none, and the schooling of the mind to be had in the observance of systematic rules is a matter not to be neglected. New plans for promoting system may at any time arise, but such plans cannot be at any [87] time understood and adopted except by those who have cultivated a taste for order and regularity.

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      49The following propositions in regard to tempering, comprehend the main points to be observed:

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      Planing machines of the most improved construction are driven by two belts instead of one, and many mechanical expedients have been adopted to move the belts differentially, so that both should not be on the driving pulley at the same time, but move one before the other in alternate order. This is easily attained by simply arranging the two belts with the distance between them equal to one and one-half or one and three-fourth times the width of the driving pulley. The effect is the same as that accomplished by differential shifting gearing, with the advantage of permitting an adjustment of the relative movement of the belts."But will you then please give me a pass, otherwise I may be detained again on my way back."


      alllittle