Agricola, Georgius
,
De re metallica
,
1912/1950
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let down from the pulley of the crane arm; the inside diameter of this ring
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is six digits, and it is about a digit and a half thick; the ring is then engaged
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in the hook whose straight stem is in the cake, and thus the cake is raised from
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the mould and put into its place.</
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<
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>The copper and lead, when thus melted, yield a small amount of “slag”
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12
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and much litharge. </
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<
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>The litharge does not cohere, but falls to pieces like the
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residues from malt from which beer is made.
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Pompholyx
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adheres to the walls
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in white ashes, and to the sides of the furnace adheres
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spodos.
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<
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>In this practical manner lead is alloyed with copper in which there is but
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a moderate portion of silver. </
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<
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>If, however, there is much silver in it, as, for
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instance, two
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líbrae,
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or two
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líbrae
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and a
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bes,
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to the
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centumpondium,
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—which
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weighs one hundred and thirty-three and a third
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líbrae,
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or one hundred and
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forty-six
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librae
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and a
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bes,
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13
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—then the foreman of the works adds to a
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centum
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pondíum
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of such copper three
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centumpondía
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of lead, in each
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centumpondium
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of which there is a third of a
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líbra
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of silver, or a third of a
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libra
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and a
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semí
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uncía.
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<
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> In this manner three liquation cakes are made, which contain
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altogether three
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centumpondía
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of copper and nine
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centumpondía
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of lead.
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14
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The
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lead, when it has been liquated from the copper, weighs seven
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centumpondia;
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and in each
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centumpondíum
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—if the
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centumpondium
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of copper contain two
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líbrae
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of silver, and the lead contain a third of a
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líbra
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—there will be a
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líbra
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and a sixth and more than a
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semí-uncía
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of silver; while in the exhausted
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liquation cakes, and in the liquation thorns, there remains a third of a
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líbra.
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