Agricola, Georgius
,
De re metallica
,
1912/1950
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and then they dig out with pointed picks the holes in the cakes, which contain
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the same kind of copper. </
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>The head of the round hammer is three palms and
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a digit long; one end of the head is round and two digits long and thick;
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the other end is chisel-shaped, and is two digits and a half long. </
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>The sharp
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pointed hammer is the same length as the round hammer, but one end is
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pointed, the other end is square, and gradually tapers to a point.</
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>A—TANK. B—BOARD. C—TONGS. D—“DRIED” CAKES TAKEN OUT OF THE TANKS.
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E—BLOCK. F—ROUNDED HAMMER. G—POINTED HAMMER.</
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>The nature of copper is such that when it is “dried” it becomes ash
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coloured, and since this copper contains silver, it is smelted again in the
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blast furnaces.
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23
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<
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>I have described sufficiently the method by which exhausted liquation
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cakes are “dried”; now I will speak of the method by which they are made
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into copper after they have been “dried.” These cakes, in order that
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they may recover the appearance of copper which they have to some extent
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lost, are melted in four furnaces, which are placed against the second long
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wall in the part of the building between the second and third transverse
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walls. </
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<
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>This space is sixty-three feet and two palms long, and since each of </
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