2021-04-18 10:03:42

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ENGLISH In cylindrical fitting, which as before pointed out, constitutes the greater part in machine fitting, gauges are especially important, because trial-fitting is in most cases impossible.

"We beseech all residents in the municipality to guard the highest interests of all the inhabitants and of those who are hostages of the German Army, and not to commit any assault on the soldiers of this army.

67The invention is now complete, and as the principles are all within the scope of practical mechanism, there is nothing left to do but to devise such mechanical expedients as will carry out the principles laid down. This mechanical scheming is a second, and in some sense an independent part of machine improvement, and should always be subservient to principles; in fact, to separate mechanical scheming from principles, generally constitutes what has been called chance invention.At Jupile I saw a pontoon-bridge, not in use for38 the moment. Just before this place a slightly sloping road leads from the hills to the eastern bank of the Meuse and the main road Vis-Lige. Along this road descended at that moment an immense military forceuhlans, cuirassiers, infantry, more cuirassiers, artillery, munition and forage-carts. The train seemed endless, and although I stood there looking at it for quite a long time, the end had not passed me.

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(1.) In what respect are air and water like belts and gearing, as means to transmit power?(2.) What are some of the principal advantages gained by employing air to operate railway brakes?(3.) Name some of the advantages of centralising motive power.(4.) Are the conditions of working an engine the same whether air or steam is employed?"The larger ones had suffered little; but the majority were jammed by fragments of concrete and steel, which struck between the armour and the front-armour. The small quick-fire cupolas had not been touched by any projectile. 'It is all right,' he said, 'we shall be able to repulse the enemy's attack.'

This is one theory of the principle upon which the Barker wheel operates, which has been laid down in Vogdes' "Mensuration," and perhaps elsewhere. The other theory alluded to is that, direct action and reaction being equal, ponderable matter discharged tangentally from the periphery of a wheel must create a reactive force equal to the direct force with which the weight is thrown off. To state it more plainly, the spouting water that issues from the arm of a Barker wheel must react in the opposite course in proportion to its weight.

Considered as a mechanical agent, a hammer concentrates the power of the arms, and applies it in a manner that meets the requirements of various purposes. If great force is required, a long swing and slow blows accomplish tons; if but little force is required, a short swing and rapid blows will servethe degree of force being not only continually at control, but also the direction in which it is applied. Other mechanism, if employed instead of hammers to perform a similar purpose, would require to be complicated [104] machines, and act in but one direction or in one plane.

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Presuming an engineering establishment to consist of one-storey buildings, and the main operations to be conducted on the ground level, the only vertical lifting to be performed will be in the erecting room, where the parts of machines are assembled. This room should be reached in every part by over-head travelling cranes, that cannot only be used in turning, moving, and placing the work, but in loading it upon cars or waggons. One result of the employment of over-head travelling cranes, often overlooked, is a saving of floor-room; in ordinary fitting, from one-third more to twice the number of workmen will find room in an erecting shop if a travelling-crane is employed, the difference being that, in moving pieces they may pass over the top of other pieces instead of requiring long open passages on the floor. So marked is this saving of room effected by over-head cranes, that in England, where they are generally employed, handling is not only less expensive and quicker, but the area of erecting floors is usually one-half as much as in America, where travelling-cranes are not employed.First.The power is connected to the hammer by means of the least possible mechanism, consisting only of a cylinder, a piston, and slide valve, induction pipe and throttle valve; these few details taking the place of a steam-engine, shafts, belts, cranks, springs, pulleys, gearing, in short, all such details as are required between the hammer-head and the steam-boiler in the case of trip-hammers or crank-hammers.

Milling tools large enough to admit of detachable cutters being employed, are not so expensive to maintain as solid tools. Edge movement can sometimes be multiplied in this way, so as to greatly exceed what a single tool will perform.CHAPTER X. MACHINERY FOR TRANSMITTING AND DISTRIBUTING POWER.The hotel where I stayed that night was called H?tel de la Paix; an hotel of peace, indeed!

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Apr-18 10:03:42