Archive image from page 505 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 BOOK X. the litharge flows out. Copper plates are placed on this part of the sole-stone so that the silver-lead or other alloy may be more rapidly heated. A dome which has the shape of half a sphere covers the crucible. It con- sists of iron bands and of bars and of a lid. There are three bands, each about a palm wide and a digit thick ; the lowest is at a distance of one foot from the middle one, and the middle one a distance of two feet from the upper one. Under them are eighteen iron bars
Archive image from page 505 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 BOOK X. the litharge flows out. Copper plates are placed on this part of the sole-stone so that the silver-lead or other alloy may be more rapidly heated. A dome which has the shape of half a sphere covers the crucible. It con- sists of iron bands and of bars and of a lid. There are three bands, each about a palm wide and a digit thick ; the lowest is at a distance of one foot from the middle one, and the middle one a distance of two feet from the upper one. Under them are eighteen iron bars fixed by iron rivets ; these bars are of the same width and thickness as the bands, and they are of such a length, that curving, they reach from the lower band to the upper, that is two feet and three palms long, while the dome is only one foot and three palms high. All the bars and bands of the dome have iron plates fastened on the underside with iron wire. In addition, the dome has four apertures ; the rear one, which is situated opposite the channel through which the litharge flows out, is two feet wide at the bottom ; toward the top, since it slopes gently, it is narrower, being a foot, three palms, and a digit wide ; there is no bar at this place, for the aperture extends from the upper band to the middle one, but not to the lower one. The second aperture is situated above the A—Rectangular stones. B—Sole-stone. C—Air-holes. D—Internal walls. E—Dome. F—Crucible. G—Bands. H—Bars. I—Apertures in the dome. K—Lid of the dome. L—Rings. M—Pipes. N—Valves. O—Chains.
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Keywords: 1900, 1950, agricola_georg_1494_1555, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, hoover_herbert_1874_1964, illustration, image, metallurgy, mineral_industries, new_york_dover_publications, page, picture, print, reference, vintage
