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    Software name: appdown
    Software type: Microsoft Framwork

    size: 842MB


    Software instructions

      Machines and tools operating by percussive action, although they comprise a numerous class, and are applied in nearly all mechanical operations, have never received that amount of attention in text-books which the importance of the machines and their extensive use calls for. Such machines have not even been set off as a class and treated of separately, although the distinction is quite clear between machines with percussive action, and those with what may be termed direct action, both in the manner of operating and in the general plans of construction. There is, of course, no lack of formul? for determining the measure of force, and computing the dynamic effect of percussive machines acting against a measured or assumed resistance, and so on; but this is not what is meant. There are certain conditions in the operation of machines, such as the strains which fall upon supporting frames, the effect produced upon malleable material when struck or pressed, and more especially of conditions which may render percussive or positive acting machines applicable to certain purposes; but little explanation has been given which is of value to practical men.

      In designing supports for shafts the strains are easily defined and followed, while the vertical and lateral adjustment, lubrication of bearings, symmetry of supports and hangers, and so on, will furnish grounds for endless modification, both as to arrangement and mechanism.

      Only because these wretched people had not promptly obeyed the order of the military to march against the fort in front of the soldiers, Vivignes had been punished, and that morning over forty of the best houses had been set on fire.

      Now the major jumped up and shouted at his subordinate that he had to treat a Netherlander as he ought to be treated.

      The action of steam-hammers may also be divided into what is termed elastic blows, and dead blows.

      "Yes, but now you see if after all you are a spy, you see, then, you see, I'll knock you down, you see?"

      III.The man who called himself Mr. Everdail nodded.


      "Are they at a great distance from here?"


      In considering pneumatic machinery there are the following points to which attention is directed:The reader may notice how everything pertaining to patterns and moulding resolves itself into a matter of judgment on the part of workmen, and how difficult it would be to apply general rules.


      In this connexion, some importance must also be attributed to the more indirect influence exercised by children; These did not form a particularly numerous class in the upper ranks of Roman society; but, to judge by what we see in modern France, the fewer there were of them the more attention were they likely to receive; and their interests, which like those of the other defenceless classes had been depressed or neglected under the aristocratic rgime, were favoured by the reforming and levelling movement of the empire. One of Juvenals most popular satires is entirely devoted to the question of their education; and, in reference to this, the point of view most prominently put forward is the importance of the examples which are offered to them by their parents. Juvenal, himself a free-thinker, is exceedingly anxious that they should not be indoctrinated with superstitious opinions; but we may be sure that a different order of considerations would equally induce others to give their children a careful religious training, and to keep them at a distance from sceptical influences; while the spontaneous tendency of children to believe in the supernatural would render it easier to give them moral instruction under a religious form.