Archive image from page 155 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 120 BOOK V. 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 hoUows they put dry wood and place amongst them at frequent intervals sticks, all sides of which are shaved down fan- shaped, which easily take hght, and when once they have taken fire com- municate it to the other bundles of wood, which easily ignite. -Kindled logs. Sticks shaved down fan-shaped. C
Archive image from page 155 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 120 BOOK V. 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 hoUows they put dry wood and place amongst them at frequent intervals sticks, all sides of which are shaved down fan- shaped, which easily take hght, and when once they have taken fire com- municate it to the other bundles of wood, which easily ignite. -Kindled logs. 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, as I wiU explain in greater detail when I come to speak of the evils which affect miners. The Bergmeister, in order to prevent workmen from being suffocated, gives no one permission to break veins or rock by fire in shafts or tunnels where it is possible for the poisonous vapour and smoke to permeate the veins or stringers and pass through into the neighbouring mines, which have no hard veins or rock. As for that part of a vein or the surface of the rock which the fire has separated from the remaining mass, if it is overhead, the miners dislodge it with a crowbar, or if it still has some degree of hardness, they thrust a smaller crowbar into the cracks and so break it down, but if
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