Agricola, Georgius
,
De re metallica
,
1912/1950
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a bellows. </
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<
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>From the crucible is a small pipe through which the molten
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bismuth runs down into a dipping-pot, and from this cakes are made.</
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<
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>On a dump thrown up from the mines, other people construct a hearth
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exposed to the wind, a foot high, three feet wide, and four and a half feet
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long. </
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<
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>It is held together by four boards, and the whole is thickly coated at
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the top with lute. </
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<
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>On this hearth they first put small dried sticks of fir wood,
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then over them they throw broken ore; then they lay more wood over it,
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and when the wind blows they kindle it. </
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<
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>In this manner the bismuth drips
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out of the ore, and afterward the ashes of the wood consumed by the fire and
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the charcoals are swept away. </
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<
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>The drops of bismuth which fall down into
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the hearth are congealed by the cold, and they are taken away with the
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tongs and thrown into a basket. </
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<
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>From the melted bismuth they make
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cakes in iron pans.</
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<
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>A—HEARTH IN WHICH ORE IS MELTED. B—HEARTH ON WHICH LIE DROPS OF BISMUTH.
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C—TONGS. D—BASKET. E—WIND.</
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<
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>Others again make a box eight feet long, four feet wide, and two feet high,
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which they fill almost full of sand and cover with bricks, thus making
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the hearth. </
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<
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>The box has in the centre a wooden pivot, which turns in a hole
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in two beams laid transversely one upon the other; these beams are hard and
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thick, are sunk into the ground, both ends are perforated, and through </
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