A rudimentary treatise on the metallurgy of silver and lead .. (1861)
Lamborn, Robert H · London, J. Weale · leaf 99
87 MEASURING SMALL GLOBULES. The fresh cupel is first well heated in the flame, and then the lead cube brought carefully upon it, and a … The second period of the cupelling requires more care than the first. A cupel should, b.e formed in the manner above described, and with a surface as smooth as possible. The same cupel that has an¬ swered for the first fusion may often be used, after giving it a new surface of fine bone-ash. The…
Silver · Lead
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