BOOK IX , 429 Other methods for reducing quicksilver are given below . Big - bellied pots , having been placed in the upper rectangular open part of a furnace , are filled with the crushed ore . Each of these pots is covered with a lid with a long nozzle — commonly called a camfiana — in the shape… … A — Pots . B — Opercula . C — Nozzles . D — Gourd - shaped earthenware vessels . wood having been placed in the lower part of the furnace and kindled , the ore is heated until all the quicksilver has risen into the operculum which is over the pot ; it then flows from the nozzle and is caught in the…
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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_000033125008455038-265-180.webp)
![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_000033125008455038-469-296.webp)
