Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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pagenum
="
67
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<
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<
s
>However, such a junction of veins sometimes disunites and in this
<
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way it happens that the vein which was the right-hand vein becomes
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the left; and again, the one which was on the left becomes the right.</
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</
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<
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type
="
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<
s
>Furthermore, one vein may be split and divided into parts by some hard
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rock resembling a beak, or stringers in soft rock may sunder the vein and
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make two or more. </
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>
<
s
>These sometimes join together again and sometimes
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remain divided.</
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>
</
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>
<
figure
number
="
33
"/>
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">
<
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>A, B—VEINS DIVIDING. C—THE SAME JOINING.</
s
>
</
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<
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type
="
main
">
<
s
>Whether a vein is separating from or uniting with another can be deter
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mined only from the seams in the rocks. </
s
>
<
s
>For example, if a principal
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lb
/>
vein runs from the east to the west, the rock seams descend in depth
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/>
likewise from the east toward the west, and the associated vein which
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/>
joins with the principal vein, whether it runs from the south or the north,
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has its rock seams extending in the same way as its own, and they do not
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conform with the seams in the rock of the principal vein—which remain
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the same after the junction—unless the associated vein proceeds in the same
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direction as the principal vein. </
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>
<
s
>In that case we name the broader vein the
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principal one, and the narrower the associated vein. </
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>
<
s
>But if the principal
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vein splits, the rock seams which belong respectively to the parts, keep
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the same course when descending in depth as those of the principal vein.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>But enough of
<
emph
type
="
italics
"/>
venae profundae,
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emph.end
type
="
italics
"/>
their junctions and divisions. </
s
>
<
s
>Now
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/>
we come to
<
emph
type
="
italics
"/>
venae dilatatae.
<
emph.end
type
="
italics
"/>
</
s
>
<
s
> A
<
emph
type
="
italics
"/>
vena dilatata
<
emph.end
type
="
italics
"/>
may either cross a
<
emph
type
="
italics
"/>
vena profunda,
<
emph.end
type
="
italics
"/>
<
lb
/>
or join with it, or it may be cut by a
<
emph
type
="
italics
"/>
vena profunda,
<
emph.end
type
="
italics
"/>
and be divided into parts.</
s
>
</
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>
</
chap
>
</
body
>
</
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>
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>