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56 SWEDENBORG’S TRAVELS AND DIARIES. [Doc. 205.
tioned : 1. There are two kinds of ore ; one which is con
tained in sand, and the other in slate. In the former sub
stance it appears under a reddish brown colour, much granulated ;
the grains being large and having an angular appearance. The
stone itself is of a white, yellow, or green colour, intermixed
with the ore. The other kind in slate is of a blackish and
grey colour ; it seems to consist of most minute grains ; mica
also generally adheres to it. 2. The ore which does not con
tain many heterogeneous substances, is crushed by stamps,
and washed three times : first on a Schlammbank or in a
narrow trough with two steps, where the washing takes place
by passing it up and down in the usual fashion ; afterwards
the pulverized ore is taken on inclined washing planes, and,
indeed, twice, and thence conveyed to the furnace. If the
ore, however, contains copper, or marcasite, or iron, it is
crushed into powder and burnt in an oven, which is like a
baker’s oven ; and afterwards it is washed three times, before
it is taken to the furnace. For by the washing the marcasite
and iron are gradually washed off and thus removed. 3. The
oven in which the burning takes place is like a baker’s oven,
and very large ; there the powder is continually stirred. This
operation is usually continued for eight or ten hours, and the
more heterogeneous substances it contains the longer it is
burnt, after which it is left in the oven until it becomes cold.
4. After it is taken out of the oven it is washed three times ;
first in a deep and narrow washing trough which consists simply
of two steps ; the pulverized ore first falls down from the top,
and is then passed to and fro, until at last the coarser powder
is obtained. The washing troughs are not long, but short.
5. The blasting furnace is either three or three and a quarter
ells high, and at its base is eight inches wide and ten inches
long, and above twelve inches wide and about sixteen inches
long, so that it becomes gradually larger above ; then the
chimney for the smoke begins, which is rather ample, and in
cludes in a certain sense the furnace below. The furnace is
arched round the opening towards the bellows ; for the wall
there is thicker. At Schlaggenwald both sides were arched,
but here only one, and indeed that towards the bellows.
5. The bellows are of leather; the blast hole which is formed
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