Metallurgy: The Art of Extracting Metals from Their Ores, and Adapting Them to Various Purposes of Manufacture, Band 2

J. Murray, 1864 - 934 Seiten

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Seite 395 - The air vessel may generally be conveniently heated by a fire, distinct from the fire to be affected by the blast or current of air, and generally it will be better that the...
Seite 877 - Of coal-mines we have such plenty in the north and western parts of our island as may suffice for all the realm of England; and so must they do hereafter indeed, if wood be not better cherished than it is at this present. And...
Seite 100 - ... or weldable. The differences between these three well-known sorts of iron essentially depend upon differences in the proportion of carbon, though, as we shall learn hereafter, other elements may and often do concur in modifying, in a striking degree, the qualities of this wonderful metal.
Seite 875 - Bawd, succeeded and exceeded his master in this his art of casting ordnance, making them cleaner and to better perfection. And his son, Thomas Johnson, a special workman, in and before the year 1595, made 42 cast pieces of great ordnance of iron, for the Earl of Cumberland, weighing 6000 Ibs., or three tons a-piece."| Whether Sussex was the scene of these operations, however, does not appear.
Seite 813 - The air expanding in volume, divides itself into globules, or bursts violently upwards, carrying with it some hundred weight of fluid metal, which again falls into the boiling mass below. Every part of the apparatus trembles under the violent agitation thus produced, a roaring flame rushes from the mouth of the vessel, and as the process advances, it changes its violet colour to orange, and finally to a voluminous pure white flame.
Seite 678 - ... the passage of air through the fire is attended with the generation of heat, whereas the production of the water gases, as well as the evolution of the hydro-carbons, is carried on at the expense of heat. The generation of steam in the water trough being dependent on the amount of heat in the fire, regulates itself naturally to the requirements ; and the total production of combustible gases varies with the admission of air. And since the admission of air into the grate depends in its turn upon...
Seite 809 - forcing currents of air, or of steam, or of air and steam, into and among the particles of molten crude iron, or of re-melted pig or refined iron, until the metal so treated is thereby rendered malleable, and has acquired other properties common to cast steel, and still retaining the fluid state of such metal, and pouring or running the same into suitable moulds.
Seite 184 - has indeed a political tendency, being written to defend the church of England against the sectaries : it is not, therefore, so much from the conclusions of the piece, as from the mode of the author's deducing...
Seite 179 - ... exploded with much force, tearing open the foil, and evolving a faint light. When dropped on the surface of heated mercury, it exploded readily at 400° of Fahrenheit, but with difficulty at 370°. When its temperature was raised slowly, it did not explode, but was decomposed quietly. When detonated in the bottom of a hot glass tube, much water and fume were given off, and the residuum collected was metallic platina with a very little iron and charcoal. We are uncertain how far this preparation...
Seite 727 - ... his kind friends as he had appeared, no one knew whence or whither. On his return to England he communicated his voyage and its results to Mr. Knight and another person in the neighbourhood, with whom he was associated, and by whom the necessary buildings were erected and machinery provided. — When at length...

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