BOOK V 120 overcame the hardness of the Alps by the use of vinegar and fire . Even if a vein is a very wide one , as tin veins usually are , miners excavate into the small streaks , and into those hollows they put dry wood and place amongst them at frequent intervals sticks , all sides of which are… … A — Kindled logs . B — Sticks shaved down fan - shaped . C — Tunnel . While the heated veins and rock are giving forth a foetid vapour and the shafts or tunnels are emitting fumes , the miners and other workmen do not go down in the mines lest the stench affect their health or actually kill them ,…
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![An illustration from Catalogvs annorvm et principvm siue monarcharvm mvndi geminvs : plerisqve in locis obscvrioribus illustratus & in caelebrioribus locupletatus atq[ue] à mendis, recognitione diligenti repurgatus : cum accessione multorum aliorum quae in priori aeditione non continebantur, quemadmodum suis locis toto libro uidere licebit, ab homine condito, usq[ue] in praesentem, à nato Christo, millesimum quingentesimum & quinquagesimum annum deductus & continuatus (1550)](https://img.insideoutlibrary.com/img/200/ia-gri_33125008666402-57-0.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_000033125008455038-294-207.webp)
