Agricola, Georgius
,
De re metallica
,
1912/1950
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also are able to signify the intermediate directions by means of the names of
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the winds. </
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<
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>For instance, if a vein runs from VI east to VI west, it is said
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to proceed from
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Subsolanus
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(east wind) to
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Favoníus
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(west wind); but one
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which proceeds from between V and VI of the east to between V and VI
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west is said to proceed out of the middle of
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Carbas
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and
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Subsolanus
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to between
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<
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Argestes
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and
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Favoníus;
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the remaining directions, and their intermediates
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are similarly designated. </
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>
<
s
>The miner, on account of the natural properties
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of a magnet, by which the needle points to the south, must fix the instru
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ment already described so that east is to the left and west to the right.</
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<
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>In a similar way to
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venae profundae,
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the
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venae dilatatae
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vary in their
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lateral directions, and we are able to understand from the seams in the
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rocks in which direction they extend into the ground. </
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>
<
s
>For if these incline
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toward the west in depth, the vein is said to extend from east to west;
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if on the contrary, they incline toward the east, the vein is said to go from
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west to east. </
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>
<
s
>In the same way, from the rock seams we can determine
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veins running south and north, or the reverse, and likewise to the
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subordinate directions and their intermediates.</
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<
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>A, B—
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Venae dilatatae.
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</
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>
<
s
> C—
<
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Seams in the Rocks.
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</
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<
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>Further, as regards the question of direction of a
<
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vena profunda,
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one
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runs straight from one quarter of the earth to that quarter which is opposite,
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while another one runs in a curve, in which case it may happen that a vein
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proceeding from the east does not turn to the quarter opposite, which is the
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west, but twists itself and turns to the south or the north.</
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>
</
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</
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</
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</
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