Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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<
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type
="
caption
">
<
s
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<
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pagenum
="
147
"/>
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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<
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main
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<
s
>But I return to our mines. </
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>
<
s
>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
<
emph
type
="
italics
"/>
Bergmeíster
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emph.end
type
="
italics
"/>
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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>
<
s
>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 </
s
>
</
p
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<
figure
number
="
75
"/>
<
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type
="
caption
">
<
s
>A—NEEDLE OF THE INSTRUMENT. B—ITS TONGUE. C, D, E—HOLES IN THE TONGUE.</
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</
chap
>
</
body
>
</
text
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>