Agricola, Georgius
,
De re metallica
,
1912/1950
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<
pb
pagenum
="
65
"/>
<
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type
="
main
">
<
s
>In the next place,
<
emph
type
="
italics
"/>
venae profundae
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emph.end
type
="
italics
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differ not a little in the manner in
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which they intersect, since one may cross through a second transversely, or
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one may cross another one obliquely as if cutting it in two.</
s
>
</
p
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<
p
type
="
main
">
<
s
>If a vein which cuts through another principal one obliquely be the
<
lb
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harder of the two, it penetrates right through it, just as a wedge of beech or
<
lb
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iron can be driven through soft wood by means of a tool. </
s
>
<
s
>If it be softer, the
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lb
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principal vein either drags the soft one with it for a distance of three feet, or
<
lb
/>
perhaps one, two, three, or several fathoms, or else throws it forward along
<
lb
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the principal vein; but this latter happens very rarely. </
s
>
<
s
>But that the vein
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lb
/>
which cuts the principal one is the same vein on both sides, is shown by its
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lb
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having the same character in its foot walls and hanging walls.</
s
>
</
p
>
<
figure
number
="
30
"/>
<
p
type
="
caption
">
<
s
>A—PRINCIPAL VEIN. B—VEIN WHICH CUTS A OBLIQUELY. C—PART CARRIED AWAY.
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D—THAT PART WHICH HAS BEEN CARRIED FORWARD.</
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>
</
p
>
<
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type
="
main
">
<
s
>Sometimes
<
emph
type
="
italics
"/>
venae profundae
<
emph.end
type
="
italics
"/>
join one with another, and from two or
<
lb
/>
more outcropping veins
<
emph
type
="
sup
"/>
4
<
emph.end
type
="
sup
"/>
, one is formed; or from two which do not outcrop
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lb
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one is made, if they are not far distant from each other, and the one dips
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into the other, or if each dips toward the other, and they thus join when they
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have descended in depth. </
s
>
<
s
>In exactly the same way, out of three or more
<
lb
/>
veins, one may be formed in depth.</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
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archimedes
>