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    Software name: appdown
    Software type: Microsoft Framwork

    size: 303MB

    Lanuage:Englist

    Software instructions

      "I don't know, Lieutenant; do you think Jewett has run back into his own lines?"


      "Are you better now?" he asked.


      Another principle in planing machines which deserves notice is the manner of driving carriages or platens; this is usually performed by means of spur wheels and a rack. A rack movement is smooth enough, and effective enough so far as a mechanical connection between the driving gearing and a platen, but there is a difficulty met with from the torsion and elasticity of cross-shafts and a train of reducing gearing. In all other machines for metal cutting, it has been a studied object to have the supports for both the tools and the material as rigid as possible; but in the common type of planing machines, such as have rack and pinion movement, there is a controversion of this principle, inasmuch as a train of wheels and several cross-shafts constitute a very effective spring between the driving power and the point of cutting, a matter that is easily proved by planing across the teeth of a rack, or the threads of a screw, on a machine arranged with spur wheels and the ordinary reducing gearing. It is true the inertia of a platen is interposed and in a measure overcomes this elasticity, but in no degree that amounts to a remedy.

      4. The speed at which shafts should run is governed by their size, the nature of the machinery to be driven, and the kind of bearings in which they are supported."Ah, no, General! By the name of the lady you love best, I beg you to see my need and let me go. I promise you never henceforth to offend your cause except in that mere woman's sympathy with what you call rebellion, for which women are not so much as banished by you--or if they are, then banish me! Treat me no better, and no worse, than a 'registered enemy'!"

      In the case of line shafting for manufactories, if the speed varies so much from that of the first movers on machines as to require one or more intermediate or countershafts, the expense would be very great; on the contrary, if countershafts can be avoided, there is a great saving of belts, bearings, machinery, and obstruction. The practical limit of speed for line shafts is in a great measure dependent upon the nature of the bearings, a subject that will be treated of in another place.


      But, after all, fortune was merciful, and I was gone; the Major had summoned me--his brother had come. I went circuitously and alone. As I started, some fellow writhing on the grass cried, "Charlie Tol--oh, this is better than a tcharade!" and a flash of divination enlightened me. While I went I burned with shame, rage and nervous exhaustion; the name Scott Gholson had gasped in my ear was the name of her in the curtained wagon, and I cursed the day in which I had heard of Charlotte Oliver.

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      "I should--have turned back, my boy." After a silence the hero said more to himself than to me "Ah, if my brother were here to-night--I might live!"

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      For milling, drilling or boring ordinary work within its range, a lathe is by no means a makeshift tool, but performs these various operations with nearly all the advantages of machines adapted to each purpose. An ingenious workman who understands the adaptation of a modern engine lathe can make almost any kind of light machinery without other tools, except for planing, and may even perform planing when the surfaces are not too large; in this way machinery can be made at an expense not much greater than if a full equipment of different tools is employed. This of course can only be when no division of labour is required, and when one man is to perform all the several processes of turning, drilling, and so on.

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      "Ferry's scouts," I repeated. "F-e-r-r-y-apostrophe s, Ferry's--s-k-o-w-t-s--scouts."


      alllittle