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In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstances—the hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.3. The saving from condensation, to which steam is exposed, avoidance of heat, and the consequent contraction and expansion of long conducting pipes.The terrified little sister was unable to stammer anything more, and in great fear suddenly closed the little shutter again.

Owing to this difference in the manner of guiding and supporting the cutting edges, and the advantages of an axial support for tools in boring, it becomes an operation by which the most accurate dimensions are attainable, while drilling is a comparatively imperfect operation; yet the ordinary conditions of machine fitting are such that nearly all small holes can be drilled with sufficient accuracy.�It was stated later on that the German authorities punished the culprits and had them executed at Aix-la-Chapelle; De Tijd of August 31st, 1914, also reported it. But the action of these soldiers was not worse than that of generals who had entire cities destroyed and civilians killed by the hundred, but were always screened by the German Government.

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�The discovery by the Germans of so-called dep?ts of Belgian rifles, each rifle labelled with the name of a citizen, was a gigantic "misunderstanding." Already before the Germans occupied the town the burgomaster had issued an order that all arms should be delivered. The inhabitants had obeyed, and the rifles were provided with a card so that each might be returned to the lawful owner after the war. This collection of arms has been used by the Germans as evidence of an organised revolt of the citizens.I stood near the spot where the ferry-boat used to take people across; but to cross was now out of the question, for any one alighting on the opposite side would be landed in the scorching glare. Therefore, I returned to Lixhe, where I might try to cross the river by the pontoon-bridge, and get to Visé along the other bank of the Meuse.

�2. Plans of adaptation and arrangement of the component parts of the machinery, or organisation as it may be called.Flat or plane joints nearly always admit of adjustment between the fitted surfaces; that is, the material scraped or ground away in fitting can be compensated by bringing the pieces nearer together; but parallel cylindrical joints cannot even be tried together until finished, consequently, there can be nothing cut away in trying them together. Tapering, or conical joints, can of course be trial-fitted, and even parallel fits are sometimes made by trial, but it is evident that the only material that can [149] be cut away in such cases, is what makes the difference between a fit too close, and one which will answer in practice.

May all the nations of the world after the war collaborate to compensate Louvain for her martyrdom, see that this city shall be restored to her former, happy prosperity, and get a library which approaches as much as possible the one she lost. The Germans can probably do their part by investigating where the motor-cars went which left the Halls on that wretched Tuesday night, heavily laden with books.�

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Count Rumford did not by chance develope the philosophy of forces upon which we may say the whole science of dynamics now rests; he set out upon a methodical plan to demonstrate conceptions that were already matured in his mind, and to verify principles which he had assumed by inductive reasoning. The greater part of really good and substantial improvements, such as have performed any considerable part in developing modern mechanical engineering, have come through this course of first dealing with primary principles, instead of groping about blindly after mechanical expedients, and present circumstances point to a time not far distant when chance discovery will quite disappear.3. The strains to which shafts are subjected are the torsional strain of transmission, transverse strain from belts and wheels, and strains from accidents, such as the winding of belts.�

�To this proposition another may be added, that shop processes may be systematised or not, as they consist in duplication, or the performance of certain operations repeatedly in the same manner. [101] It has been shown in the case of patterns that there could be no fixed rules as to their quality or the mode of constructing them, and that how to construct patterns is a matter of special knowledge and skill.A moment later a gigantic motor-car came racing down at a great speed. Six soldiers stood up in it, their rifles pointed at me. I thought that they36 intended to shoot me and everybody they might meet, but a seventh soldier standing by the side of the chauffeur made a movement with his arms, from which I understood that he wanted me to put my hands up. I did so.

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Assuming, for example, that a machine will cost as much as the wages of an attendant for one year, which is not far from an average estimate for iron working machine tools, and that interest, wear, and repairs amount to ten per cent. on this sum, then the attendance would cost ten times as much as the machine; in other words, the wages paid to a workman to attend a machine is, on an average, ten times as much as the other expenses attending its operation, power excepted. This assumed, it follows that in machine tools any improvement directed to labour saving is worth ten times as much as an equal improvement directed to the economy of first cost.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.A drilling machine, adapted to the usual requirements of a machine fitting establishment, consists essentially of a spindle arranged to be driven at various speeds, with a movement for feeding the drills; a firm table set at right angles to the spindle, and arranged with a vertical adjustment to or from the spindle, and a compound adjustment in a horizontal plane. The simplicity of the mechanism required to operate drilling tools is such that it has permitted various modifications, such as column drills, radial drills, suspended drills, horizontal drills, bracket drills, multiple drills, and others.

The town was entirely shut off from war- and other news."I know that those rumours have been spread about, but also that they were contradicted by Belgian officials. I know also, and can affirm it from my own personal observation, that there is not a single word of truth in those accusations, for I passed the early days of the war in the district where the fight was going on."�