Agricola, Georgius
,
De re metallica
,
1912/1950
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91 - 120
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151 - 180
181 - 210
211 - 240
241 - 270
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421 - 450
451 - 480
481 - 510
511 - 540
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<
pb
pagenum
="
56
"/>
<
p
type
="
main
">
<
s
>Others, on the contrary, run from north to south.</
s
>
</
p
>
<
figure
number
="
18
"/>
<
p
type
="
caption
">
<
s
>A, B, C—VEIN. D, E, F—
<
emph
type
="
italics
"/>
Seams in the Rocks.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>The seams in the rocks indicate to us whether a vein runs from the
<
lb
/>
east or from the west. </
s
>
<
s
>For instance, if the rock seams incline toward the
<
lb
/>
westward as they descend into the earth, the vein is said to run from east
<
lb
/>
to west; if they incline toward the east, the vein is said to run from west
<
lb
/>
to east; in a similar manner, we determine from the rock seams whether
<
lb
/>
the veins run north or south.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Now miners divide each quarter of the earth into six divisions; and by
<
lb
/>
this method they apportion the earth into twenty-four directions, which they
<
lb
/>
divide into two parts of twelve each. </
s
>
<
s
>The instrument which indicates these
<
lb
/>
directions is thus constructed. </
s
>
<
s
>First a circle is made; then at equal
<
lb
/>
intervals on one half portion of it right through to the other, twelve
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lb
/>
straight lines called by the Greeks
<
foreign
lang
="
grc
">διάμετροι,</
foreign
>
and in the Latin
<
emph
type
="
italics
"/>
dímetíentes,
<
emph.end
type
="
italics
"/>
<
lb
/>
are drawn through a central point which the Greeks call
<
foreign
lang
="
grc
">κέντρον,</
foreign
>
so that
<
lb
/>
the circle is thus divided into twenty-four divisions, all being of an equal
<
lb
/>
size. </
s
>
<
s
>Then, within the circle are inscribed three other circles, the outer
<
lb
/>
most of which has cross-lines dividing it into twenty-four equal parts; the
<
lb
/>
space between it and the next circle contains two sets of twelve numbers,
<
lb
/>
inscribed on the lines called “diameters”; while within the innermost circle
<
lb
/>
it is hollowed out to contain a magnetic needle
<
emph
type
="
sup
"/>
3
<
emph.end
type
="
sup
"/>
. </
s
>
<
s
>The needle lies directly </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>