. De re metallica. Metallurgy; Mineral industries. 374 BOOK IX. bellows in rotation. Finally we must not omit to state that this is only one of many such axles having cams and a water-wheel. I have arrived thus far with many words, and yet it is not unseasonable that I have in this place pursued the subject minutely, since the smelting of all the metals, to which I am about to proceed, could not be undertaken without it. The ores of gold, silver, copper, and lead, are smelted in a furnace by four different methods. The first method is for the rich ores of gold or silver, the second for the med
. De re metallica. Metallurgy; Mineral industries. 374 BOOK IX. bellows in rotation. Finally we must not omit to state that this is only one of many such axles having cams and a water-wheel. I have arrived thus far with many words, and yet it is not unseasonable that I have in this place pursued the subject minutely, since the smelting of all the metals, to which I am about to proceed, could not be undertaken without it. The ores of gold, silver, copper, and lead, are smelted in a furnace by four different methods. The first method is for the rich ores of gold or silver, the second for the mediocre ores, the third for the poor ores, and the fourth method is for those ores which contain copper or lead, whether they contain precious metals or are wanting in them. The smelting of the first ores is performed in the furnace of which the tap-hole is intermittently closed ; the other three ores are melted in furnaces of which the tap-holes are always open. First, I will speak of the manner in which the furnaces are prepared for the smelting of the ores, and of the first method of smelting. The powder from which the hearth and forehearth should be made is composed of char- coal and earth (clay ?). The charcoal is crushed by the stamps in a mortar- box, the front of which is closed by a board at the top, while the A—Tub. B—Sieve. C—Rods. D— Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications
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