A great share of the handling about an engineering establishment is avoided, if material can be stored and received on a higher level than the working floors; if, for instance, coal, iron, and sand is received from railway cars at an elevation sufficient to allow it to be deposited where it is stored by gravity, it is equivalent to saving the power and expense required to raise the material to such a height, or move it and pile it up, which amounts to the same thing in the end. It is not proposed to follow the details [74] of shop arrangement, farther than to furnish a clue to some of the general principles that should be regarded in devising plans of arrangement. Such principles are much more to be relied upon than even experience in suggesting the arrangement of shops, because all experience must be gained in connection with special local conditions, which often warp and prejudice the judgment, and lead to error in forming plans under circumstances different from those where the experience was gained.VI.
ONE:"Be a lesson to us all," Harcourt said sapiently, "for at least a month. And then we shall run after the next flashy adventurer who comes along. Give me the money, and I'll put any gutter flower-girl in society, and at the top of all in a month. It's only a question of cash."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.
THREE:"I've done more than that, sir," said Prout. "I've stumbled on something important relating to that Corner House business. And if you don't want me any more, I'd like to go and see Mr. Gilbert Lawrence."To construe the term "transmission of power" in its full sense, it will, when applied to machinery, include nearly all that has motion; for with the exception of the last movers, or where power passes off and is expended upon work that is performed, all machinery of whatever kind may be called machinery of transmission. Custom has, however, confined the use of the term to such devices as are employed to convey power from one place to another, without including organised machines through which power is directly applied to the performance of work. Power is transmitted by means of shafts, belts, friction wheels, gearing, and in some cases by water or air, as various conditions of the work to be performed may require. Sometimes such machinery is employed as the conditions do not require, because there is, perhaps, nothing of equal importance connected with mechanical engineering of which there exists a greater diversity of opinion, or in which there is a greater diversity of practice, than in devices for transmitting power.
"Say," the other whispered fiercely. "Poor Leon--is he dead?"Near Haccourt, by the bank of the Meuse, I noticed a terrible glare of fire and dense smoke. It was an alarming sight, and made me fear the direst things. I considered for a moment whether I should go there or not, fearing that I had already taxed my nerves too much. Yet, I made up my mind to go, and by a side-way got to the Meuse, near Vis. German engineers were busy here laying telephone wires, and an officer stopped me, threatening me with his revolver. It was obvious that they were no longer accustomed to see civilians on that road. After having examined my passport and seeing that I was a Netherland journalist, he became very friendly, and politely urged me not to go farther.Planing machines of the most improved construction are driven by two belts instead of one, and many mechanical expedients have been adopted to move the belts differentially, so that both should not be on the driving pulley at the same time, but move one before the other in alternate order. This is easily attained by simply arranging the two belts with the distance between them equal to one and one-half or one and three-fourth times the width of the driving pulley. The effect is the same as that accomplished by differential shifting gearing, with the advantage of permitting an adjustment of the relative movement of the belts.There was nothing for it now but to obey. Hetty followed slowly and crept up to her own bedroom. Once there, she dropped into a chair, and just for the moment the whole world seemed to be whirling before her sightless eyes.
