BOOK XII . 537 … A — Lower chamber of the first furnace . B — Upper chamber . C — Vitreous mass . and in the third they cool the glowing glass vessels and other articles . Of these the first furnace must be vaulted and similar to an oven . In the upper chamber , which is six feet long , four feet wide , and two…
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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_000033125008455038-425-274.webp)
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