Agricola, Georgius - De re metallica

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1not yet pierced between the miners who on opposite sides are digging on
the same vein, or cross-stringers, or two veins which are approaching one
another.

But I return to our mines. If the surveyor desires to fix the boundaries
of the meer within the tunnels or drifts, and mark to them with a sign cut in the
rock, in the same way that the Bergmeíster has marked these boundaries
above ground, he first of all ascertains, by measuring in the manner
which I have explained above, which part of the tunnel or drift lies
beneath the surface boundary mark, stretching the cords along the drifts to
a point beyond that spot in the rock where he judges the mark should be
cut. Then, after the same cords have been laid out on the surveyor's field,
he starts from that upper cord at a point which shows the boundary mark,
and stretches another cross-cord straight downward according to the sixth

75[Figure 75]

A—NEEDLE OF THE INSTRUMENT. B—ITS TONGUE. C, D, E—HOLES IN THE TONGUE.

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