n working. walls of the furnace. Its temperature is, in are conveyed from the quarries on carts or cars silver, and these are operated on for the recov- By the old method the lead was exposed to the fact, higher; for not only does it share in the to sheds, in which thev are again split and cut ery… … painting their houses. cast-iron pans,each holding about 3 tuns of metal, and heated bya fire below. The process | is repeated for 3 or 4 times for each charge ; and ’ the rich silver is finally purified from lead by cupellation. This description of the process will be read- ily understood, and,…
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