BOOK IX . 432 covered with lids a digit thick , and they are smeared over on the inside with liquid litharge , and on the lid are placed heavy stones . The pots are set on the furnace , and the ore is heated and similarly exhales quicksilver , which fleeing from the heat takes refuge in the lid ;… … A — Pots . B — Lids . C — Stones . D — Furnace . By these five methods quicksilver may be made , and of these not one is to be despised or repudiated ; nevertheless , if the mine supplies a great abundance of ore , the first is the most expeditious and practical , because a large quantity of ore…
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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_000033125008455038-364-244.webp)
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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_000033125008455038-482-305.webp)
