BOOK IX . 430 Others build a hollow vaulted chamber , of which the paved floor is made concave toward the centre . Inside the thick walls of the chamber are the furnaces . The doors through which the wood is put are in the outer part of the same wall . They place the pots in the furnaces and fill… … A — Enclosed chamber . B — Door . C — Little windows . D — Mouths through the walls . E — Furnace in the enclosed chamber . F — Pots . furnaces except through their mouths . Between the dome and the paved floor they arrange green trees , then they close the door and the little windows , and cover…
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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_000033125008455038-362-242.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_000033125008455038-350-233.webp)
