Agricola, Georgius, De re metallica, 1912/1950

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But since truly the twigs of the miners do move, albeit they do not
generally
use incantations, some say this movement is caused by the
power
of the veins, others say that it depends on the manipulation, and
still
others think that the movement is due to both these causes.
But, in
truth
, all those objects which are endowed with the power of attraction
do
not twist things in circles, but attract them directly to themselves; for
instance
, the magnet does not turn the iron, but draws it directly to itself,
and
amber rubbed until it is warm does not bend straws about, but simply
draws
them to itself.
If the power of the veins were of a similar nature to
that
of the magnet and the amber, the twig would not so much twist as
move
once only, in a semi-circle, and be drawn directly to the vein, and unless
the
strength of the man who holds the twig were to resist and oppose the
force
of the vein, the twig would be brought to the ground; wherefore,
since
this is not the case, it must necessarily follow that the manipulation
is
the cause of the twig's twisting motion.
It is a conspicuous fact that
these
cunning manipulators do not use a straight twig, but a forked one
cut
from a hazel bush, or from some other wood equally flexible, so that if it
be
held in the hands, as they are accustomed to hold it, it turns in a circle
for
any man wherever he stands.
Nor is it strange that the twig does not
turn
when held by the inexperienced, because they either grasp the forks of
the
twig too tightly or hold them too loosely.
Nevertheless, these things
give
rise to the faith among common miners that veins are discovered by
the
use of twigs, because whilst using these they do accidentally discover
some
; but it more often happens that they lose their labour, and although
they
might discover a vein, they become none the less exhausted in
digging
useless trenches than do the miners who prospect in an unfortunate
locality
.
Therefore a miner, since we think he ought to be a good and
serious
man, should not make use of an enchanted twig, because if he is
prudent
and skilled in the natural signs, he understands that a forked stick
is
of no use to him, for as I have said before, there are the natural indica­
tions
of the veins which he can see for himself without the help of twigs.
So if Nature or chance should indicate a locality suitable for mining, the
miner
should dig his trenches there; if no vein appears he must dig
numerous
trenches until he discovers an outcrop of a vein.

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