Agricola, Georgius
,
De re metallica
,
1912/1950
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
Page concordance
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 679
>
Scan
Original
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 679
>
page
|<
<
of 679
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
pb
pagenum
="
106
"/>
<
p
type
="
main
">
<
s
>I have spoken of shafts, tunnels, and drifts. </
s
>
<
s
>I will now speak of the
<
lb
/>
indications given by the
<
emph
type
="
italics
"/>
canales,
<
emph.end
type
="
italics
"/>
by the materials which are dug out, and by
<
lb
/>
the rocks. </
s
>
<
s
>These indications, as also many others which I will explain, are
<
lb
/>
to a great extent identical in
<
emph
type
="
italics
"/>
venae dilatatae
<
emph.end
type
="
italics
"/>
and
<
emph
type
="
italics
"/>
venae cumulatae
<
emph.end
type
="
italics
"/>
with
<
emph
type
="
italics
"/>
venae
<
lb
/>
profundae.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>When a stringer junctions with a main vein and causes a swelling, a
<
lb
/>
shaft should be sunk at the junction. </
s
>
<
s
>But when we find the stringer inter
<
lb
/>
secting the main vein crosswise or obliquely, if it descends vertically down
<
lb
/>
to the depths of the earth, a second shaft should be sunk to the point where
<
lb
/>
the stringer cuts the main vein; but if the stringer cuts it obliquely the
<
lb
/>
shaft should be two or three fathoms back, in order that the junction may
<
lb
/>
be pierced lower down. </
s
>
<
s
>At such junctions lies the best hope of finding the
<
lb
/>
ore for the sake of which we explore the ground, and if ore has already been
<
lb
/>
found, it is usually found in much greater abundance at that spot. </
s
>
<
s
>Again,
<
lb
/>
if several stringers descend into the earth, the miner, in order to pierce
<
lb
/>
through the point of contact, should sink the shaft in the midst of these
<
lb
/>
stringers, or else calculate on the most prominent one.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Since an inclined vein often lies near a vertical vein, it is advisable
<
lb
/>
to sink a shaft at the spot where a stringer or cross-vein cuts them both;
<
lb
/>
or where a
<
emph
type
="
italics
"/>
vena dilatata
<
emph.end
type
="
italics
"/>
or a stringer
<
emph
type
="
italics
"/>
dilatata
<
emph.end
type
="
italics
"/>
passes through, for minerals
<
lb
/>
are usually found there. </
s
>
<
s
>In the same way we have a good prospect of finding
<
lb
/>
metal at the point where an inclined vein joins a vertical one; this is why
<
lb
/>
miners cross-cut the hangingwall or footwall of a main vein, and in these
<
lb
/>
openings seek for a vein which may junction with the principal vein a few
<
lb
/>
fathoms below. </
s
>
<
s
>Nay, further, these same miners, if no stringer or cross
<
lb
/>
vein intersects the main vein so that they can follow it in their workings,
<
lb
/>
even cross-cut through the solid rock of the hangingwall or footwall. </
s
>
<
s
>These
<
lb
/>
cross-cuts are likewise called “
<
foreign
lang
="
grc
">κρυπταί,</
foreign
>
” whether the beginning of the
<
lb
/>
opening which has to be undertaken is made from a tunnel or from a drift.
<
lb
/>
</
s
>
<
s
>Miners have some hope when only a cross vein cuts a main vein. </
s
>
<
s
>Further,
<
lb
/>
if a vein which cuts the main vein obliquely does not appear anywhere
<
lb
/>
beyond it, it is advisable to dig into that side of the main vein toward which
<
lb
/>
the oblique vein inclines, whether the right or left side, that we may ascer
<
lb
/>
tain if the main vein has absorbed it; if after cross-cutting six fathoms it
<
lb
/>
is not found, it is advisable to dig on the other side of the main vein, that
<
lb
/>
we may know for certain whether it has carried it forward. </
s
>
<
s
>The owners
<
lb
/>
of a main vein can often dig no less profitably on that side where the vein
<
lb
/>
which cuts the main vein again appears, than where it first cuts it; the
<
lb
/>
owners of the intersecting vein, when that is found again, recover their title,
<
lb
/>
which had in a measure been lost.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>The common miners look favourably upon the stringers which come
<
lb
/>
from the north and join the main vein; on the other hand, they look
<
lb
/>
unfavourably upon those which come from the south, and say that these do
<
lb
/>
much harm to the main vein, while the former improve it. </
s
>
<
s
>But I think
<
lb
/>
that miners should not neglect either of them: as I showed in Book III,
<
lb
/>
experience does not confirm those who hold this opinion about veins, so now </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>