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Doc. 205.] 55
SWEDENBORG’S TRAVELS IN 1733.
revolve by a water-wheel. The millstone consists of a very
thick grey rock, divided into two hemispheres ; between these
two hemispheres there is a distance of a third of a foot.
Their thickness is one foot ; their diameter an ell and a third.
Below is a round nether stone, about an ell thick, on which
the grinding takes place. These stones are enclosed in a
capacious wooden receptacle, the height of which is an ell
and a third, and its diameter two ells. 4. The grinding is
carried on for about six hours, when a thick blue water is let
out of the grinding box. 5. It is then pumped into a large
tub, where the water is allowed to rest either for a half, for three
quarters, or for a whole hour. 6. After it has remained there for
such a length of time, a firm blue mass, like glue, settles on
the bottom, when the water which is above is drawn off into
other most ample reservoirs, where it remains for 24, 48, or
60 hours, if necessary. 7. The sediment in this second re
servoir is taken out, and prepared into the above-mentioned
colour. 8. The substance which remains at the bottom of
the first tub, is constantly stirred, and fresh water poured on,
when another still coarser sediment is obtained. The turbid
water above is likewise drawn off into other reservoirs ; and
this operation is repeated over and over again, until the whole
colouring matter, of various shades, is obtained. 9. This good
sediment after being dried is again reduced to powder ; for it
soon becomes hard either upon being exposed to the sun be
fore the house when the weather is fine, or in a large box
in a drying kiln. This rubbing into powder is done by hand ;
after which the powder is removed to a stand, five ells long
and three ells wide, consisting of a stone, where it is gradually
dried by a fire underneath ; for there is a fire-place under it,
five ells long, and three ells broad, into which wood, but
chiefly the roots of trees, is thrown, and whereby the stone
slab on the top is constantly kept heated to that degree which
is required for this work. In this manner that blue colour
is obtained which is called "smalt, " [in Swedish] " stärkelse."
August 10. I left Platten and reached Hans Jürgenstadt
or Johann Georgenstadt, which is a town about half a German
mile distant; there cobalt, bismuth, and tin are obtained.
With respect to tin the following particulars may be men
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