Agricola, Georgius
,
De re metallica
,
1912/1950
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61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 312
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<
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>Others reduce the ore in iron pans as next described. </
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<
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>They lay small
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pieces of dry wood alternately straight and transversely upon bricks, one and
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a half feet apart, and set fire to it. </
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<
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>Near it they put small iron pans lined
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on the inside with lute, and full of broken ore; then when the wind
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blows the flame of the fierce fire over the pans, the bismuth drips out of the
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ore; wherefore, in order that it may run, the ore is stirred with the tongs; but
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when they decide that all the bismuth is exuded, they seize the pans with
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the tongs and remove them, and pour out the bismuth into empty pans, and
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by turning many into one they make cakes. </
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<
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>Others reduce the ore, when it is
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not mixed with
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cadmía,
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60
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in a furnace similar to the iron furnace. </
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<
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>In this
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case they make a pit and a crucible of crushed earth mixed with pulverised </
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<
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>A—WOOD. B—BRICKS. C—PANS. D—FURNACE. E—CRUCIBLE. F—PIPE.
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G—DIPPING-POT.
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charcoal, and into it they put the broken ore, or the concentrates from
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washing, from which they make more bismuth. </
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>
<
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>If they put in ore,
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they reduce it with charcoal and small dried wood mixed, and if concentrates,
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they use charcoal only; they blow both materials with a gentle blast from </
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