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Doc. 205.] 57
SWEDENBORG’S TRAVELS IN 1733.
of pure clay or of stone is rather oblique ; when measured in
this oblique direction it is eight or nine inches long ; the
hole itself is round, with a diameter of two inches, which is
very narrow; at Schlaggenwald it was wider. The obliquity
must be very accurately calculated, so that it is directed to
wards the opening in front, out of which the tin flows ; unless
this oblique direction is most exact, much tin is lost. 6. Out
side the furnace are two receptacles or basins ; one of which
is seven or eight inches below the aperture through which the
metal is discharged ; the other, which is excavated from the
rock, and is of an oval shape, is about nine or ten inches
below the former; into this the metal flows perpendicularly
out of the other. 7. A spadeful of the ore, and yet not quite
a spadeful, is dropped into the furnace each time, and a
bucket of wet charcoal emptied on the top ; this bucket is rather
small
. Such charges are put into the furnace about three
times an hour, the time being longer or shorter according
as the ore smelts more or less readily. 8. The smelted metal
flows out continually from the furnace into the upper recep
tacle ; and thence more or less is let off once every hour into
the lower receptacle, according as the yield of the tin is
greater or less. 9. The work of smelting is usually continued
for 10, 20, or even 48 hours. 10. At first, until the furnace
is heated, the work proceeds more slowly and with greater
difficulty ; especially because there are not yet fresh scoriæ
on hand. Afterwards, when there is a supply of these, they
are mixed with the pulverized ore, and then the metal begins
to flow readily; these scoriæ may be used over again, twice
or more frequently, according as the ore requires it. 11. The
liquid tin is afterwards poured out with a ladle on an iron
table, so that it may be spread out thin ; it is poured on
various parts of the table, until it becomes a thin, coherent sheet,
when it receives three impressions of a seal. The sheet is
now rolled up and pounded together on a stone with a hammer
into a sort of compressed roll, so that it is thin, and can
easily be fused. 12. Five, six, or seven of these rolls are ob
tained at each discharge of the metal, which takes place about
once an hour; and each roll weighs from five to seven pounds,
each being marked with three seals.
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