BOOK X . 449 … A — Pot . B — Circular fire . C — Crucibles . D — Their lids . E — Lid of the pot . F — Furnace . G — Iron rod . the black - coloured granules are taken out , and afterward thirty - three librae of these granules are placed in an earthen crucible , if it has such capacity . For every libra of…
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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_000033125008455038-186-124.webp)
