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ENGLISH 波多野结衣要隐退了A leading principle in machinery of transmission that more than any other furnishes data for strength and proper proportions is, that the stress upon the machinery, whatever it may be, is inverse as the speed at which it moves. For example, a belt two inches wide, moving one thousand feet a minute, will theoretically perform the same work that one ten inches wide will do, moving at a speed of two hundred feet a minute; or a shaft making two hundred revolutions a minute will transmit four times as much power as a shaft making but fifty revolutions in the same time, the torsional strain being the same in both cases."Nor must you tell them that we detained you here. That was really not our intention at all, but just now we had no time to examine your papers."The men stopped their horses, dismounted, and returned the fire from behind their animals. This went on for about a quarter of an hour. Every one was alarmed by this shooting; other soldiers came racing in from the station, and others ran to and fro near that building crying, "A surprise attack!" Some, thinking that the attack came from the advancing Belgians, rushed to the place where the fighting took place, others misunderstood the cry, believed that the citizens assaulted them, and began to shoot at these, and at the houses.
There is, however, a principle in hydraulic machinery that must be taken into account, in comparing it with positively geared mechanism, which often leads to loss of power that in many cases will overbalance any gain derived from the peculiar action of hydraulic apparatus. I allude to the loss of power incident to dealing with an inelastic medium, where the amount of force expended is constant, regardless of the resistance offered. A hydraulic crane, for instance, consumes power in proportion to its movements, and not as the amount of duty performed; it takes the same quantity of water to fill the cylinders of such cranes, whether the water exert much or little force in moving the pistons. The difference between employing elastic mediums like air and steam, and an inelastic medium like water, for transmitting force in performing irregular duty, has been already alluded to, and forms a very interesting study for a student in mechanics, leading, as it does, to the solution of many problems concerning the use and effect of power.Details and sketches, when made on a separate sheet, should be to a larger scale than elevations. By changing from one scale to another the mind is schooled in proportion, and the conception of sizes and dimensions is more apt to follow the finished work to which the drawings relate.As even high officers told me those things, not without some emotion, I began to believe them and wrote something about them to my paper. But what was made clear to me at a later visit! That there was not a word of truth in the whole story of that poisoning; that on that day and in that square no shooting had taken place; that a couple of days before the population had been ordered to leave their houses within two hours without any reason being given; and afterwards several houses had simply been burned down.
Having assumed a certain work to do, the cutting of tooth racks ? in. pitch, and 3 in. face, the first thing to be considered will be, is the machine to be a special one, or one of general adaptation? This question has to do, first, with the functions of the machine in the way of adapting it to the cutting of racks of various sizes, or to performing other kinds of work, and secondly, as to the completeness of the machine; for if it were to be a standard one, instead of being adapted only to a special purpose, there are many expensive additions to be supplied which can be omitted in a special machine. It will be assumed in the present case that a special machine is to be constructed for a particular duty only.It has been already remarked that the boldness of young engineers is very apt to be inversely as their experience, not to say their want of knowledge, and it is only by a strong and determined effort towards conservatism, that a true balance is maintained in judging of new schemes.
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No one has been able to explain clearly why a sudden change of temperature hardens steel, nor why it assumes various shades of colour at different degrees of hardness; we only know the fact, and that steel fortunately has such properties.143
Bicycling was of course out of the question; I shouldered my bicycle and stepped across the glowing cinders, which singed my soles. One spot could still be recognised as a street corner. Three soldiers emerged there suddenly and aimed at me with their rifles.The beastly scenes which I witnessed in the glaring, scorching heat benumbed me, and I looked on vacantly for a long time. At last I went back and called at St. Hadelin College, the Head of which I had visited already once or twice. The building was still undamaged."We are engaged now most actively upon the re-establishment of the municipal services: Police, Municipal Register, and the Services of the Canals, which services will all be reopened as soon as possible.
Third.The soundness of such parts as are to be planed, bored, and turned in finishing; this is also a matter that is determined mainly by how the patterns are arranged, by which is the top and which the bottom or drag side, the manner of drawing, and provisions for avoiding dirt and slag.
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Connected with screw dies, there are various problems, such as clearance behind the cutting edge; whether an odd or even number of edges are best; how many threads require to be bevelled at the starting point; and many other matters about which there are no determined rules. The diversity of opinion that will be met with on these points, and in reference to taps, the form of screw-threads, and so on, will convince a learner of the intricacies in this apparently simple matter of cutting screw-threads.
Expedients to avoid dirt in such castings as are to be finished all over or on two sides are various. Careful moulding to avoid loose sand and washing is the first requisite; sinking heads, that rise above the moulds, are commonly employed when castings are of a form which allows the dirt to collect at one point. Moulds for sinking heads are formed by moulders as a rule, but are sometimes provided for by the patterns.Early next morning I walked through the streets of Lige, dull and depressed, deploring the fact that such clumsy, heavy iron monsters had been able to crush this stout defence and such men. As I reached the Place du March, there arrived three hundred disarmed Belgian warriors, escorted by a strong German force. They stopped in the square, and soon hundreds of the people of Lige crowded around them. They were the defenders of Fort Pontisse.
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