. De re metallica. Metallurgy; Mineral industries. BOOK X. 485. A—SxRAiGHT KXIFE HAVING WOODEN" IIANDLEa. B—CuRVED KNIFE LIKEWISE HAVING WOODEN HANDLES. C—CURVED KNIFE WITHOUT WOODEN HANDLES. D—SlEVE. E—Balls. F—Iron door which the master lets down when he refines silver, lest THE heat of the FIRE SHOULD INJURE HIS EYES. G—IrON IMPLEMENT ON WHICH THE WOOD IS PLACED WHEN THE LIQUID SILVER IS TO BE REFINED. H—ItS OTHER PART PASSING THROUGH THE RING OF ANOTHER IRON IMPLEMENT ENCLOSED IN THE WALL OF THE FURNACE. I—Tests in which burning charcoal has been thrown. hold much less than fifteen li
. De re metallica. Metallurgy; Mineral industries. BOOK X. 485. A—SxRAiGHT KXIFE HAVING WOODEN" IIANDLEa. B—CuRVED KNIFE LIKEWISE HAVING WOODEN HANDLES. C—CURVED KNIFE WITHOUT WOODEN HANDLES. D—SlEVE. E—Balls. F—Iron door which the master lets down when he refines silver, lest THE heat of the FIRE SHOULD INJURE HIS EYES. G—IrON IMPLEMENT ON WHICH THE WOOD IS PLACED WHEN THE LIQUID SILVER IS TO BE REFINED. H—ItS OTHER PART PASSING THROUGH THE RING OF ANOTHER IRON IMPLEMENT ENCLOSED IN THE WALL OF THE FURNACE. I—Tests in which burning charcoal has been thrown. hold much less than fifteen librae of silver, others twenty, some thirty, others fortj7, and others fifty. All these tests thus prepared are dried in the sun, or set in a warm and covered place ; the more dry and old they are the better. All of them, when used for refining silver, are heated by means of burning charcoal placed in them. Others use instead of these tests an iron ring ; but the test is more useful, for if the powder deteriorates the silver remains in it, while there being no bottom to the ring, it falls out ; besides, it is easier to place in the hearth the test than the iron ring, and furthermore it requires much less powder. In order that the test should not break and damage the silver, some bind it round with an iron band. In order that they may be more easily broken, the silver cakes are placed upon an iron grate by the refiner, and are heated by burning charcoal placed under them. He has a brass block two palms and two digits long and wide, with a channel in the middle, which he places upon a block of hard wood. Then with a double-headed hammer, he beats the hot cakes of silver. 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 Publ
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