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62 SWEDENBORG’S TRAVELS AND DIARIES. [Doc. 205.
times every quarter of an hour two spadesful of the pulverized
ore are thrown in, and one pail of moistened charcoal.
The ore which contains sulphur is calcined in the open
air; the fire is continued in the heap only for four or five
hours ; the remaining ore is calcined in an oven, as has been
explained in connection with the other works.
The poor tin ore is crushed here at Platten in the open
air by crushing hammers, which are not under cover ; there
are three hammers in each crushing box ; I have also seen
two only. Outside is the receptacle of the ore which stands
obliquely, and verges towards the first hammer; into this re
ceptacle also the water flows, and thence into the crushing
box. There are two outlets from the crushing box, but they
meet in one trough. The trough is outside, and a little
oblique ; where it ends, an inclined washing plane begins, over
which the water containing the lighter powdered mass flows,
and thus is carried away. Others have another inclined plane
in addition to this, on which the powder may at once be
washed a second time.
I have learned many things at Hans Jürgenstadt and at
Platten, namely, 1. that at Hans Jürgenstadt as well as at
Joachimsthal water-wheels and machines are in the mines
below, at a depth of a hundred ells, and that by means of
these machines , as well as by a wheel turned by the wind,
the water is pumped up. 2. At Platten I saw how out of one
central shaft (Stockwerk) several roads, arteries, or ramifi
cations proceed ; this could be seen from a collapsed and in
jured mine. 3. Further, that the air may be pumped into the
deepest places by means of bellows ; for the bellows are set
in motion by the same machine by which the ore is raised ;
the air is led into these places by wooden pipes which have
no other outlet except where there is no draught, and where
the air is constantly stagnant and heated. 4. That the crush
ing hammers or stamps are not weighted with iron, but with
a black stone which is very hard ; also that the bottom of the
crushing box is wooden and oblique. They said the operation
of crushing by means of stone upon wood could be accom
plished as easily as by means of stamps with an iron end.
5. At Joachimsthal they have bellows, where the aperture is
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