Agricola, Georgius, De re metallica, 1912/1950

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The truth is, they assert, the movement of the twig is caused by the
power
of the veins, and sometimes this is so great that the branches of trees
growing
near a vein are deflected toward it.
On the other hand, those
who
say that the twig is of no use to good and serious men, also deny that
the
motion is due to the power of the veins, because the twigs will not move
for
everybody, but only for those who employ incantations and craft.
More­
over
, they deny the power of a vein to draw to itself the branches of trees,
but
they say that the warm and dry exhalations cause these contortions.
Those who advocate the use of the twig make this reply to these objections:
when
one of the miners or some other person holds the twig in his hands,
and
it is not turned by the force of a vein, this is due to some peculiarity
of
the individual, which hinders and impedes the power of the vein, for since
the
power of the vein in turning and twisting the twig may be not unlike
that
of a magnet attracting and drawing iron toward itself, this hidden
quality
of a man weakens and breaks the force, just the same as garlic
weakens
and overcomes the strength of a magnet.
For a magnet smeared
with
garlic juice cannot attract iron; nor does it attract the latter when
rusty
.
Further, concerning the handling of the twig, they warn us that
we
should not press the fingers together too lightly, nor clench them too
firmly
, for if the twig is held lightly they say that it will fall before the force
of
the vein can turn it; if however, it is grasped too firmly the force of the
hands
resists the force of the veins and counteracts it.
Therefore, they
consider
that five things are necessary to insure that the twig shall serve
its
purpose: of these the first is the size of the twig, for the force of the
veins
cannot turn too large a stick; secondly, there is the shape of the twig,
which
must be forked or the vein cannot turn it; thirdly, the power of the
vein
which has the nature to turn it; fourthly, the manipulation of the twig;
fifthly
, the absence of impeding peculiarities.
These advocates of the twig
sum
up their conclusions as follows: if the rod does not move for every­
body
, it is due to unskilled manipulation or to the impeding peculiarities
of
the man which oppose and resist the force of the veins, as we said above,
and
those who search for veins by means of the twig need not necessarily make
incantations
, but it is sufficient that they handle it suitably and are devoid
of
impeding power; therefore, the twig may be of use to good and serious

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