Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
66 SWEDENBORG’S TRAVELS AND DIARIES. [Doc. 205.
there is a paved surface between. At one corner of the oven
there is an exit for the smoke ; for cobalt is said to smoke con
tinually, like sulphur from marcasite. 2. The smoke issues
through that opening in the oven, and is led thence through
a duplicate passage, first to the right, then downwards to the
left, and finally, through a passage which is thirty ells long, it
is driven against a wall, from which it recoils, and being
beaten back, it makes its way in another direction into a corner ;
here some doors are open, through which the lighter smoke
can pass off, the denser smoke being thrown down towards the
bottom. These doors may be opened or shut at pleasure. At
the extreme end an exit is also open above the roof, through
which the smoke finally passes out. Meanwhile, throughout
all these ways, passages, and windings the heavier part of the
smoke tends to the bottom, and settles down thickly on the
paved surface, whence it is collected in the form of a white
flour. These passages may be made longer and more winding
at pleasure. 3. This burning or sublimation lasts for twelve
days and nights ; during that time from 200 to 250 hundred
weight of powdered arsenic are generally obtained . 4. The
cobalt, from which the sublimated arsenic is collected, is
crushed in the stamping mill and washed in the usual manner,
and then, like the other ore, is introduced into the blast
furnace, and the silver extracted from it. 5. This powdered
arsenic is collected and fused in the following manner: There
are two fire-places about five ells long and a foot broad, with
their grates for the ashes ; above is a stone or iron surface ;
on this four iron plates are laid, which are a third of
a foot thick , and an ell and a half . in length and in
breadth ; in the middle is a round and shallow cavity, which is
about a foot in diameter, and a quarter of a foot in depth.
According to the length of each fire-place four of these iron
plates are placed upon it; on the two fire-places, consequently,
eight of these plates are laid. On each plate or over each
cavity an iron hat or cone is fitted, which is an ell and three
quarters high, and which is interiorly well lined with clay. The
lower opening of this hat has a diameter of three-quarters of
an ell, and its upper opening one-third of a foot. This hat
is filled with two hundred-weight [ ?] of the above-mentioned
<< prev. page << föreg. sida << >> nästa sida >> next page >>
