. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 333 Some people construct a frame not unlike the one covered with canvas, but shorter. In place of the canvas they set pieces of turf in rows. They. A—Head of frame. B—Small launder through which water flows into head of FRAME. C—Pieces of turf. D—Trough placed under frame. E—Tub in which PIECES OF turf are WASHED. wash the sand, which has been thrown into the head of the frame, by letting in water. In this way the particles of gold settle in the turf, the mud and sand, together with the water, are carried down into the settling-pit
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 333 Some people construct a frame not unlike the one covered with canvas, but shorter. In place of the canvas they set pieces of turf in rows. They. A—Head of frame. B—Small launder through which water flows into head of FRAME. C—Pieces of turf. D—Trough placed under frame. E—Tub in which PIECES OF turf are WASHED. wash the sand, which has been thrown into the head of the frame, by letting in water. In this way the particles of gold settle in the turf, the mud and sand, together with the water, are carried down into the settling-pit or trough below, which is opened when the work is finished. After all the water has passed out of the settling-pit, the sand and mud are carried away and washed over again in the same manner. The particles which have clung to the turf are afterward washed down into the settling-pit or trough by a stronger current of the water, which is let into the frame through a small launder. The concentrates are finally collected and washed in a bowl. Pliny was not ignorant of this method of washing gold. " The ulex," he says, " after being dried, is burnt, and its ashes are washed over a grassy turf, that the gold may settle on ;. 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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