1and thick with these he pushes the sticks
of wood forward and the bars
then rest on the trestles. There are others who, when they separate metals,
put two such sticks of wood into the crucible through the aperture which is
between the bellows, as many through the holes at the back, and one through
the channel; but in this case a larger number of long sticks of wood is
necessary, that is, sixty; in the former case, forty long sticks of wood suffice
to carry out the operation. When the lead has been heated for two hours,
it is stirred with a hooked bar, that the heat may be increased.
then rest on the trestles. There are others who, when they separate metals,
put two such sticks of wood into the crucible through the aperture which is
between the bellows, as many through the holes at the back, and one through
the channel; but in this case a larger number of long sticks of wood is
necessary, that is, sixty; in the former case, forty long sticks of wood suffice
to carry out the operation. When the lead has been heated for two hours,
it is stirred with a hooked bar, that the heat may be increased.
If it be difficult to separate the lead from the silver, he throws copper
and charcoal dust into the molten silver-lead alloy. If the alloy of argen
tiferous gold and lead, or the silver-lead alloy, contains impurities from the
ore, then he throws in either equal portions of argol and Venetian glass or of
sal-ammoniac, or of Venetian glass and of Venetian soap; or else unequal
portions, that is, two of argol and one of iron rust; there are some who
mix a little saltpetre with each compound. To one centumpondium of the
alloy is added a bes or a líbra and a third of the powder, according
to whether it is more or less impure. The powder certainly separates the
impurities from the alloy. Then, with a kind of rabble he draws out through
and charcoal dust into the molten silver-lead alloy. If the alloy of argen
tiferous gold and lead, or the silver-lead alloy, contains impurities from the
ore, then he throws in either equal portions of argol and Venetian glass or of
sal-ammoniac, or of Venetian glass and of Venetian soap; or else unequal
portions, that is, two of argol and one of iron rust; there are some who
mix a little saltpetre with each compound. To one centumpondium of the
alloy is added a bes or a líbra and a third of the powder, according
to whether it is more or less impure. The powder certainly separates the
impurities from the alloy. Then, with a kind of rabble he draws out through
A—FURNACE. B—STICKS OF WOOD. C—LITHARGE. D—PLATE.
E—THE FOREMAN
WHEN HUNGRY EATS BUTTER, THAT THE POISON WHICH THE CRUCIBLE EXHALES MAY NOT
HARM HIM, FOR THIS IS A SPECIAL REMEDY AGAINST THAT POISON.
WHEN HUNGRY EATS BUTTER, THAT THE POISON WHICH THE CRUCIBLE EXHALES MAY NOT
HARM HIM, FOR THIS IS A SPECIAL REMEDY AGAINST THAT POISON.
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