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