Agricola, Georgius
,
De re metallica
,
1912/1950
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not yet pierced between the miners who on opposite sides are digging on
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the same vein, or cross-stringers, or two veins which are approaching one
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another.</
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>But I return to our mines. </
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>If the surveyor desires to fix the boundaries
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of the meer within the tunnels or drifts, and mark to them with a sign cut in the
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rock, in the same way that the
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Bergmeíster
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has marked these boundaries
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above ground, he first of all ascertains, by measuring in the manner
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which I have explained above, which part of the tunnel or drift lies
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beneath the surface boundary mark, stretching the cords along the drifts to
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a point beyond that spot in the rock where he judges the mark should be
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cut. </
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>Then, after the same cords have been laid out on the surveyor's field,
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he starts from that upper cord at a point which shows the boundary mark,
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and stretches another cross-cord straight downward according to the sixth </
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>A—NEEDLE OF THE INSTRUMENT. B—ITS TONGUE. C, D, E—HOLES IN THE TONGUE.</
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