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46 SWEDENBORG’S TRAVELS AND DIARIES. [ Doc. 205.
is done in this oven, the better the tin is said to separate
afterwards and to liquefy ; and the softer and better the tin
itself becomes. After the burning is finished, the ore is left in
the oven for two or three days, until it has become cold ; and
in this way all the sulphur is expelled from the ore. 6. If
the pulverized ore is calcined thus, it does not lump , but re
mains pulverized, as it was at first ; and after being taken out
of the oven, it is washed on inclined planes, just as before,
and this washing is continued, until nothing except the heaviest
part, which is either black or white, remains ; if there is any
thing red remaining, it is a sign that the washing or the
separation has not yet been sufficiently carried on.
In Schlaggenwald and Schönfeld there are altogether eleven
blast furnaces ; but they differ somewhat in their construction,
and in their interior dimensions. There are some furnaces of
which there are a pair or two in one building, so that after
the work of smelting or liquefaction is brought to a close in
one, it may be continued at once in the other. There are also
others which are single, and after the work of smelting has been
finished, and some time after the furnaces have become cool,
the work is commenced anew. Those furnaces in Schlaggen
wald which use glandular ore, or which use the ore from the
glandular mine, Stockwerk, have the following proportion in
height and breadth, or they are constructed as follows : The
solid stone which is the hearth where the tin is smelted, is
raised about an ell and a third over the floor of the building
or works. Close to this hearth, which is about an ell and a
third above the floor, is the opening out of which the molten
metal continually pours into a receptacle (tigillum) constructed
about half an ell beneath it; for through this little opening
the tin with its scoriæ continually flows out in a stream. The
hearth is a pure rock, and there is no superstructure upon it
of a carbonaceous or argillaceous substance ; it is almost hori
zontal, and slopes only a very little forward. On the opposite
side is the blast-hole which is obliquely directed into the interior;
it is two-thirds of a foot long, and consists of clay or stone
only. Through this oblique hole, the anterior hole through
which the liquid metal runs out is visible in a straight line.
The bellows are of leather, and not very large. The interior
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