时间:2021-01-20 19:09:19



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          原标题:多起无接触快递存放点盗窃案告破  新冠肺炎疫情发生以来,大部分社区都设立了无接触快递存放点,减少人员密切接触。澶

          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.



          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.黏─プゥ


          CHAPTER IIIこぅ濠コ去躜


          There the German authorities detained me for a full week, by prohibiting me to return: "for the sake of your own safety," they told me courteously. During the day I was busy enough, and in the evenings I enjoyed the pleasant company of the three fathers of the Sacred Heart who had remained in the137 mission house, and with whose photographic instrument I took many a snapshot of the Louvain ruins.サ埭讠ぅ乓


          I went to bed early, for that day I had again walked from Maastricht to Liège. My little bedroom was quite in the roof of the house, and had evidently been used by a servant.夷妞膜


          It is also necessary to learn as soon as possible the technicalities pertaining to lathe work, and still more important to learn the conventional modes of performing various operations. Although lathe work includes a large range of operations which are continually varied, yet there are certain plans of performing each that has by long custom become conventional; to gain an acquaintance with these an apprentice should watch the practice of the best workmen, and follow their plans as near as he can, not risking any innovation or change until it has been very carefully considered. Any attempt to introduce new methods, modes of chucking work, setting and grinding tools, or other of the ordinary operations in turning, may not only lead to awkward mistakes, but will at once put a stop to useful information that might otherwise be gained from others. The technical terms employed in describing lathe work are soon learned, generally sooner than they are needed, and are often misapplied, which is worse than to be ignorant of them.窕ゥぅ胜ぅト




          For the rest most houses in the market-place were on fire. Soldiers were billeted on one of the corner houses, and I was of course detained there, but released again, after having been requested to show up the francs-tireurs. I had to consider also where I might pass the night in this burning city? I asked an officer's consent to stay the night with the soldiers. He gave his permission if I could get the consent of the commanding officer, whom I might find at the station; he told me that he was sure to grant it.┨蜞イ让

          I was the only civilian in that road, and the soldiers, with much curiosity, stared at me. Whenever I noticed an officer, I gave an elaborate military salute, and with such an air that the officers, although hesitating at first, did not fail to return the salute.荪ゥ欷ザ糕恝

            2021-01-20 19:09:19