Agricola, Georgius, De re metallica, 1912/1950

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The miner's pick differs from a peasant's pick in that the latter is wide
at the bottom and sharp, but the former is pointed.
It is used to dig out
ore which is not hard, such as earth.
Likewise a hoe and shovel are in no
way different from the common articles, with the one they scrape up earth
and sand, with the other they throw it into vessels.
Now earth, rock, mineral substances and other things dug out with
the pick or hewn out with the “iron tools” are hauled out of the shaft
in buckets, or baskets, or hide buckets; they are drawn out of tunnels in
wheelbarrows or open trucks, and from both they are sometimes carried in
trays.
Buckets are of two kinds, which differ in size, but not in material or
shape.
The smaller for the most part hold only about one metreta; the
larger are generally capable of carrying one-sixth of a congius; neither is
of unchangeable capacity, but they often vary.3 Each is made of staves circled
with hoops, one of which binds the top and the other the bottom.
The hoops are sometimes made of hazel and oak, but these are easily
broken by dashing against the shaft, while those made of iron are more
durable.
In the larger buckets the staves are thicker and wider, as also are
both hoops, and in order that the buckets may be more firm and strong,
they have eight iron straps, somewhat broad, four of which run from the
upper hoop downwards, and four from the lower hoop upwards, as if to meet
each other.
The bottom of each bucket, both inside and outside, is furnished
with two or three straps of iron, which run from one side of the lower hoop
to the other, but the straps which are on the outside are fixed crosswise.
Each bucket has two iron hafts which project above the edge, and it has an
iron semi-circular bail whose lower ends are fixed directly into the hafts,
that the bucket may be handled more easily.
Each kind of bucket is much
deeper than it is wide, and each is wider at the top, in order that the material
which is dug out may be the more easily poured in and poured out again.
Into the smaller buckets strong boys, and into larger ones men, fill earth
from the bottom of the shaft with hoes; or the other material dug up is
shovelled into them or filled in with their hands, for which reason these men
are called “shovellers.4” Afterward they fix the hook of the drawing-rope
into the bale; then the buckets are drawn up by machines—the smaller ones,
because of their lighter weight, by machines turned by men, and the larger
ones, being heavier, by the machines turned by horses.
Some, in place
of these buckets, substitute baskets which hold just as much, or even more,
since they are lighter than the buckets; some use sacks made of ox-hide
instead of buckets, and the drawing-rope hook is fastened to their iron bale,
usually three of these filled with excavated material are drawn up at the
same time as three are being lowered and three are being filled by boys.
The
latter are generally used at Schneeberg and the former at Freiberg.

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