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54 SWEDENBORG’S TRAVELS AND DIARIES. [Doc. 205.
is kept in a liquid state. 5. At the lower part of the retort
is a little hole, through which that part of it which is heavier,
and which is nearest the bottom, can flow; this part is said
to consist of heavy scoria which when fractured are said to
look like cobalt ; this is twice, and sometimes more frequently,
mixed with the above-named mixture, i. e. it is pulverized
and mixed, until, finally, no more blue colour can be extracted.
It is then rejected, as being no longer of any use, and is
called Speiss. 6. The liquid substance is poured out of the
retorts into water, where it is broken into fragments, which
are afterwards pulverized and manufactured into blue colour.
In another establishment different proportions are used
for the mixture-for there are several works between Platten
and Hans Jürgenstadt- viz. six-quarters or one and a half
hundred-weight of calcined and crushed cobalt, three-quarters
of a hundred-weight of scoriæ obtained from the pans or re
torts, two hundred-weight of potash, and four hundred-weight of
sand, which mixture is fused. The process of smelting lasts
nine hours. After the scoriæ have been used over two or
three times, they are considered as Speiss, which, when
fractured, looks like crude granulated iron ; yet it is thrown
away as of no value. With regard to the cobalt itself, after
it has come from the mine in a crude form, it is put into an
oven, not unlike a baker’s oven, which is about four ells long
and wide, but very low, since it is scarcely three-quarters of
an ell high in the middle; there it is calcined in the usual
manner. There is an exit in front for the smoke, and as soon
as it comes out of the oven, it at once rises, and passes
through the chimney into the open air. The opening itself is
very small. After the cobalt has been calcined, it is crushed
well in a stamping mill, and afterwards sifted and mixed.
ADDITIONAL PROCESSES IN PREPARING THE BLUE COLOUR.
The above blue glass is crushed dry under three hammers,
and passed through an oblique sieve; and that part which can
not pass through is again crushed and sifted. 2. Three mea
sures, i. e. bags, half an ell high and three-quarters of an ell
in diameter, are now taken into the mill. 3. The millstones
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