Van Nostrand's Engineering Magazine, Volume 9D. Van Nostrand, 1873 |
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acid amount applied blast furnace boiler bricks bridge carbon carbonic acid carried cars cast iron cause cent centre charge chimney coal coke combustion considerable construction cost cubic cubic centimetres cubic foot cylinder diameter effect electricity employed engine equal experiments explosion fact fire flue force fuel gases gravity greater gun-cotton gunpowder heat hematite holes hour increase kilogrammes length less load locomotive manufacture material matter maximum means ment metal metres miles molecules nitroglycerine obtained ordinary pass pig iron pipes piston plates plumb-bob portion practical present pressure produced proportion purposes quantity rails railway Raniganj resistance retort rifling river rivet shearing shearing strain ship slag square inch steam steel stone strain strength surface temperature thickness tion tons tunnel tuyeres velocity vessel wall weight wood wood gas wrought iron
Popular passages
Page 160 - Now when Jesus was born in Bethlehem of Judea in the days of Herod the king, behold, wise men from the East came to Jerusalem, saying, "Where is he who has been born king of the Jews? For we have seen his star in the East, and have come to worship him.
Page 533 - Stefan, of Vienna, has recently, by a very delicate method, succeeded in determining the conductivity of air, and he finds it, as he tells us, in striking agreement with the value predicted by the theory. All these three kinds of diffusion — the diffusion of matter, of momentum, and of energy — are carried on by the motion of the molecules.
Page 536 - Thus molecular science teaches us that our experiments can never give us anything more than statistical information, and that no law deduced from them can prete"nd to absolute precision. But when we pass from the contemplation of our experiments to that of the molecules themselves, we leave the world of chance and change, and enter a region where everything is certain and immutable. The molecules are conformed to a constant type with a precision which is not to be found in the sensible properties...
Page 536 - ... method of dealing with large groups of molecules. The data of the statistical method as applied to molecular science are the sums of large numbers of molecular quantities. In studying the relations between quantities of this kind, we meet with a new kind of regularity, the regularity of averages, which we can depend upon quite sufficiently for all practical purposes, but which can make no claim to that character of absolute precision which belongs to the laws of abstract dynamics.
Page 152 - At whatever period timber is felled, it requires to be thoroughly seasoned, before it is fit for the purposes of carpentry. The object of seasoning is partly to evaporate as much of the sap as possible, and thus to prevent its influence in causing decomposition ; and partly to reduce the dimensions of the wood, so that it may be used without inconvenience from its further shrinking. Timber seasons best, when placed in dry situations, where the air has a free circulation round it. Gradual drying is...
Page 153 - ... period. The application of salt in minute quantities, is said rather to hasten, than prevent the decay of vegetable and animal bodies. Yet the practice of docking timber, by immersing it for some time in sea water, after it has been seasoned, is generally admitted to promote its durability. There are some experiments which appear to show, that after the dry rot has commenced, immersion in salt water effectually checks its progress, and preserves the remainder of the timber.
Page 140 - The area of a chimney in inches, for a low-pressure steam engine, when above 10 horse power, should be 112 times the horse power of the engine, divided by the square root of the height of the chimney in feet.
Page 243 - loads at low temperatures, but that they do lose, to a very serious extent, their power of sustaining shocks or of resisting sharp blows, and that the factors of safety in structures need not be increased in the former . case, where exposure to severe cold is apprehended ; but that machinery, rails, and other constructions which are to resist shocks should have larger factors of safety, and should be most carefully protected, if possible, from extreme temperatures.
Page 531 - ... called the pressure of air and other gases. This appears to have been first suspected by Daniel Bernoulli, but he had not the means which we now have of verifying the theory. The same theory was afterwards brought forward independently by Lesage, of Geneva, who, however, devoted most of his labour to the explanation of gravitation by the impact of atoms. Then Herapath, in his Mathematical Physics...
Page 19 - 1st. In all long pillars of the same dimensions, the resistance to crushing by flexure is about three times greater when the ends of the pillars are flat, than when they are rounded.