1these, when they have been roasted as much as is necessary and re-smelted,
the copper is made. But if there be some silver in the cakes, for which an
outlay of lead has to be made, then it is first run into the forehearth, and
the molten lead absorbs the silver.
the copper is made. But if there be some silver in the cakes, for which an
outlay of lead has to be made, then it is first run into the forehearth, and
the molten lead absorbs the silver.
Indeed, rudis copper ore of
inferior quality, whether ash-coloured or
purple, blackish and occasionally in parts blue, is smelted in the first
furnace whose tap-hole is always open. This is the method of the Tyrolese.
To as much rudis copper ore as will fill eighteen vessels, each of which holds
purple, blackish and occasionally in parts blue, is smelted in the first
furnace whose tap-hole is always open. This is the method of the Tyrolese.
To as much rudis copper ore as will fill eighteen vessels, each of which holds