e lead a third of a libra and a semi - uncia , there will be in each liquation cake one and a half librae and a semi - uncia , and a little more than a sicilicus of silver . In the exhausted liquation cakes there remain a third of a libra and a semi - uncia of silver . If there be in the copper… … A — Furnace . B — Forehearth . C — Dipping - Pot . D — Cakes . furnace , vaulted with unbaked bricks , is similar to an oven , and also to the cupellation furnace , in which the lead is separated from silver , which I described in the last book . The crucible is made of ashes , in the same manner…
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![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-382-256.webp)
