s not successful , the second , or in any event the third , may be certain . While the assayer is assaying the ore , in order to prevent the great heat of the fire from injuring his eyes , it will be useful for him always to have ready a thin wooden tablet , two palms wide , with a handle by which… … A — Handle of tablet . B — Its crack . Now the lead which has absorbed the silver from a metallic ore is con sumed in the cupel by the heat in the space of three quarters of an hour . When the assays are completed the muffle is taken out of the furnace , and the ashes removed with an iron shovel ,…
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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_000033125008455038-208-138.webp)
