Elements of Metallurgy: A Practical Treatise on the Art of Extracting Metals from Their Ores

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Griffin, 1887 - 848 páginas
 

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Página 1 - The bellows are burned, the lead is consumed of the fire; the founder melteth in vain : for the wicked are not plucked away. Reprobate silver shall men call them, because the Lord hath rejected them.
Página 1 - Son of man, the house of Israel is to me become dross: all they are brass, and tin, and iron, and lead, in the midst of the furnace ; they are even the dross of silver.
Página 1 - Only the gold, and the silver, the brass, the iron, the tin, and the lead, 23 Every thing that may abide the fire, ye shall make it go through the fire, and it shall be clean: nevertheless it shall be purified with the water of separation: and all that abideth not the fire ye shall make go through the water.
Página 483 - The furnace itself for blowing the Tin is called the Castle on account of its strength, being of massive stones cramped together with Iron to endure the united force of fire and air. This fire is made with charcoal excited by two large bellows, which are worked by a water-wheel, the same as at the iron forges. They are about eight feet long and two and a half wide at the broadest part. The fire-place, or castle, is about six feet perpendicular, two feet wide in the top part each way, and about fourteen...
Página 802 - ... thrown hissing into a concentrated solution of common salt, to free it from any adherent chloride of silver. " An alloy containing originally 89 per cent, of gold, 10 per cent, of silver, and...
Página 224 - Neilson, for an improved application of air to produce heat in fires, forges, and furnaces...
Página 102 - ... economising the heat it gives off, as, for instance, in drying the fuel ; but the saving to be effected is not very great, for as 100 volumes of the gas require for combustion about 130 volumes of air, including 20 per cent, above that theoretically required, the heat given off in cooling the gas...
Página 800 - ... forms a glaze on the inner surface of the crucibles when they become hot in the furnace. When used for refining these French clay crucibles are placed within black-lead pots as a precaution against loss should the former crack, which, however, seldom happens. The crucibles are covered with loosely-fitting lids with the requisite holes bored through them for the passage of the clay chlorine pipes, &c.
Página 67 - Through the apertures loft in the upper end at e, the turf is introduced ; they are then shut with an iron plate, /, which is covered with ashes or sand. The fireplace opens above this aperture, and its outlet is provided with a movable iron cover, g, in which there is a small hole for the issue of the gases. The sole of the kiln consists of a cast-iron slab, A, which may be raised by means of a hook, i, upon it.
Página 15 - Alloys having a specific gravity inferior to the mean of their components. Gold and Silver ., Iron „ Lead „ Copper „ Iridium „ Nickel Silver and Copper Copper and Lead Iron and Bismuth „ Antimony „ Lead Tin and Lead „ Palladium „ Antimony Nickel and Arsenic Zinc and Antimony.

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