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ENGLISH ҧ·Proceeding from these premises, the first thing should be to examine the action of existing valve gear, to determine where this want of the dead-stroke function can best be supplied, and to gain the aid of such suggestions as existing mechanism may offer, also to see how far the appliances in use may become a part of any new arrangement.Chuck-boring is employed in three cases; for holes of shallow depth, taper holes, and holes that are screw-threaded. As pieces are overhung in lathe-boring there is not sufficient rigidity neither of the lathe spindle nor of the tools to admit of deep boring. The tools being guided in a straight line, and capable of acting at any angle to the axis of rotation, the facilities for making tapered holes are complete; and as the tools are stationary, and may be instantly adjusted, the same conditions answer for cutting internal screw-threads; an operation corresponding to cutting external screws, except that the cross motions of the tool slide are reversed.

Machines and tools that operate by blows, such as hammers and drops, produce effect by the impact of a moving mass by force accumulated throughout a long range, and expending the sum of this accumulated force on an object. The reactive force not being communicated to nor resisted by the machine frames, is absorbed by the inertia of the mass which gave the blow; the machinery required in such operations being only a weight, with means to guide or direct it, and mechanism for connection with motive power. A hand-hammer, for example, accumulates and applies the force of the arm, and performs all the functions of a train of mechanism, yet consists only of a block of metal and a handle to guide it.

During my visit I happened to make the acquaintance of Mr. Derricks, a brother of the lawyer who had been murdered so cruelly at Canne, and also a member of the Provincial States. The poor man was deeply moved when he heard the details about his brother's death. I made him very happy by taking a letter with me for his sister-in-law, who was now at Maastricht.

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Having got them, several officers examined my credentials, and their faces showed that the horizon was a little clearer for me.

(1.) In comparing steam-hammers with trip or crank hammers what mechanism does steam supplant or represent?(2.) What can be called the chief distinction between steam and other hammers?(3.) Under what circumstances is an automatic valve motion desirable?(4.) Why is a dead or uncushioned blow most effective?(5.) Will a hammer operate with air the same as with steam?Many shops were closed on account of lack of stock, as everything had been requisitioned, and as yet no traffic was allowed to bring in fresh pro109visions. All this bother made the inhabitants discontented, but frightened them at the same time; they grumbled and whispered, and looked about with malicious, flaming eyes, but in mortal fear.CHAPTER XXX. TURNING LATHES.

It is generally a safe rule to assume that any custom long and uniformly followed by intelligent people is right; and, in the absence of that experimental knowledge which alone enables one to judge, it is safe to receive such customs, at least for a time, as being correct.

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The time in which the contraction takes place is as the temperature of the bath and the cross section of the piece; in other words the heat passes off gradually from the surface to the centre.

Suddenly every one in the Vrijthof ran in the same direction. I waited calmly, and saw pass by a tragically long train of hooded carts and other peasants' conveyances. The drivers walked by the side of the horses, the Red Cross flag flew from the carriages, fresh clean straw covered their floor, on which wounded soldiers writhed in excruciating pain. The crowd did not press nearer, but, standing silently in long rows, let the sad procession pass by. Such were the first impressions of the war got in these days; nobody uttered a sound, but many stealthily brushed a tear away.I thought the result of the battle of Haelen rather important, and should have liked to have wired it immediately to my paper. Until now I had always gone on foot, that being the only conveyance which the Germans could not seize. But this time I preferred a bicycle, as the only way to get to The Netherlands on that same day. So I tried at a couple of bicycle-shops to get a second-hand one for love and money. At the first shop I asked:

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Apr-21 01:33:21