576 pegs or wedges driven into them . The vitriol adheres to these laths , and within the space of a few days congeals into cubes , which are taken away and put into a chamber having a sloping board floor , so that the moisture which drips from the vitriol may flow into a tub beneath . This… … A — Wooden tub . B — Cross - bars . C — Laths . D — Sloping floor of the chamber . E — Tub placed under it . The fourth method of making vitriol is from vitriolous earth or stones . Such ore is at first carried and heaped up , and is then left for five or six months exposed to the rain of spring…
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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_000033125008455038-257-172.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)
![An illustration from Directorium humanae vite, alias Parabole antiquoru[m] sapientu[m] (1488)](https://img.insideoutlibrary.com/img/200/locbook-loc_49031138-12-1.webp)
