A rudimentary treatise on the metallurgy of silver and lead .. (1861)
Lamborn, Robert H · London, J. Weale · leaf 217
205 LIQUATION HEARTH. In from half to three-quarters of an hour, the rich lead begins to trickle from the disks, and falling between the iron plates, runs out into the basin, c . At first, the heat is kept moderate, that too much copper may not go over into the lead, but, as the lead drains out, a… … When, at length, the lead ceases to flow, the operation is known to be complete, the fire is allowed to go out, and the porous mass of copper permitted to cool. The principal products that result from this operation are two, viz. : — Rich lead , which is usually given over to the process of…
Silver · Lead
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