. De re metallica. Metallurgy; Mineral industries. BOOK VII. 255 The gth needle of 15 duellae of silver and 9 duellae of gold. loth nth 12th 13th 14th 15th i6th 17th i8th 19th 20th 2ISt 22nd 23rd 24th 14 13 12 II 10 9 8 7 6 5 4 3 2 I pure gold ID II 12 13 14 15 16 17 18 19 20 21 22 23. By the first eleven needles, when they are rubbed on the touchstone, we test what proportion of gold a bar of silver contains, and with the remaining thirteen we test what proportion of silver is in a bar of gold; and also what proportion of either may be in money. Since some gold coins are composed of gold and
. De re metallica. Metallurgy; Mineral industries. BOOK VII. 255 The gth needle of 15 duellae of silver and 9 duellae of gold. loth nth 12th 13th 14th 15th i6th 17th i8th 19th 20th 2ISt 22nd 23rd 24th 14 13 12 II 10 9 8 7 6 5 4 3 2 I pure gold ID II 12 13 14 15 16 17 18 19 20 21 22 23. By the first eleven needles, when they are rubbed on the touchstone, we test what proportion of gold a bar of silver contains, and with the remaining thirteen we test what proportion of silver is in a bar of gold; and also what proportion of either may be in money. Since some gold coins are composed of gold and copper, thirteen needles of another kind are made as follows :—. 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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