he larger ones are made cupels in which silver is separated from copper and lead . Both moulds are made out of brass and have no bottom , in order that the cupels can be taken out of them whole . The pestles also are of two kinds , smaller and larger , each likewise of brass , and from the lower… … A — Little mould . B — Inverted mould . C — Pestle . D — Its knob . E — Second pestle . So much for these matters . I will now speak of the preparation of the ore for assaying . It is prepared by roasting , burning , crushing , and wash ing . It is necessary to take a fixed weight of ore in order…
e-rara · Eisenbibliothek Schlatt · No known copyright restrictions. Free to use for anything.
![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_000033125008455038-202-135.webp)
