. De re metallica. Metallurgy; Mineral industries. BOOK A.—Mortar. B—Open end of mortar. C—Slab of rock. D—Iron sole plates. E—Screen. F—Launder. G—Wooden shovel. H—Settling pit. I—Iron SHOVEL, K—Heap of material which has settled. L—Ore which requires CRUSHING. M—Small 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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