. De re metallica. Metallurgy; Mineral industries. 528 BOOK XL or after two hours, if it was soft and fragile. The workman adds charcoal to them where he sees it is needed, throwing it into the furnace through the openings on both sides between the side walls and the closed door. This open- ing is a foot and a palm wide. He lets down the door, and when the " slags " begin to flow he opens the passages with a bar ; this should take place after five hours ; the door is let down over the upper open part of the arch for two feet and as many digits, so that the master can bear the violenc
. De re metallica. Metallurgy; Mineral industries. 528 BOOK XL or after two hours, if it was soft and fragile. The workman adds charcoal to them where he sees it is needed, throwing it into the furnace through the openings on both sides between the side walls and the closed door. This open- ing is a foot and a palm wide. He lets down the door, and when the " slags " begin to flow he opens the passages with a bar ; this should take place after five hours ; the door is let down over the upper open part of the arch for two feet and as many digits, so that the master can bear the violence of the heat. When the cakes shrink, charcoal should not be added to them lest they should melt. If the cakes made from poor and fragile copper are " dried " with cakes made from good hard copper, very often the copper so settles into the passages that a bar thrust into them cannot penetrate them. This bar is of iron, six feet and two palms long, into which a wooden handle five feet long is inserted. The refiner draws off the " slags " with a rabble from the right side of the hearth. The blade of the rabble is made of an iron plate a foot and a palm wide, gradually narrowing toward the handle; the blade is two palms high, its iron handle is two feet long, and the wooden handle set into it is ten feet long. When the exhausted liquation cakes have been " dried," the master. A—The door raised -Hooked bar. C—Two-pronged rake. D—Tongs. E— 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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Keywords: ., bookauthoragricolageorg14941555, bookcentury1900, booksubjectmin
