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466 FORTIA’S TRAVELS IN SWEDEN.
The officers are a prefident, a mafter of the mines, two jurors, a fifcal, a mafter of
the engines, eight /#igere, a comptroller for dividing the ore, a number of book-keepers,
and at the weighing engine an infpetor on account of the crown. The council of the
mine fits twice a week: as often as any occurrence takes place of any importance regard-
ing the fociety, it aflembles and gives its advice.
Here a variety of ores, rock, and other ftones are found in abundance, that is to fay,
precipitate of copper, yellow copper ore, fteel grained, {coriz grained, white copper ore,
yellow, hepatic, grey, black, very much impregnated with iron, yellow in o¢taedra, en-
crufted with mica; iron ore of a blackith caft, which anfwers the magnet, very-rare,
and oétaedral encrufted with mica, likewife attracted by the magnet, cryftallized gyp-
fum, rhomboidal and prifmatic, martial pyrites, fometimes in a cry(tallized {tate ; mineral
pitch, rather rare, fluoric cryftallized gypfum, and white ftriated calcareous {par, gra-
nulated calcareous ftone, rock garnets, garnets cryftallized in decaedra, fometimes as
large as a man’s head, (Mr. Gahn has one of an enormous fize ;) a rock of fibrous ftri-
ated and ftarry fchoerle, potter’s ftone, granulated and folid quartz, unctuous and dry ;
amianthus, galena fraught with filver in large cubes and fcaly, fcaiy blend, blue, green,
and white native vitriol, the latter very rare ; zeolites very friable, and of a brick colour ;
fometimes among the fcoriz: you meet with curious matters among other cryftals of the
fame form as the bluith cellulary hematites.
Vitriol manufactory. In 1775, by private contract, a privilege was granted to three
perfons to make vitriol; the water from the mine is received in a refervoir, and thence’
conduéted by a canal to fix compartments, made on a very high wooden feaffold, one
hundred and twenty-eight feet long ; thefe canals have a number of holes on each fide
to admit the water to drop over faggots of three feet breadth, fome lying and others
ereét, made of birch for want of other wood; fixty-fix cocks let out the water into the
fix compartments of the canal, which is about two feet broad from one extremity to
the other, perhaps an inch more at the entrance of the firft compartment ; this flight
increafe of breadth, however, we conceive, has been accidental, although the fize of the
compartments might be lefs by degrees fince the volume of water decreafes. The water
is then let into the firft compartment, whence it falls into another refervoir, through the
chinks; it is carried back into the fecond,’ whence it drops again into the third refer-
voir, and fo on to the fixth, when it is plain it will depofit moft of vitriolic matter, the
quantity encreafing at every frefh exudation. ‘The {pecific gravity of the water being
1280, on coming from the mine is reduced after the graduation to 1250, or at moit
1260. In winter the works are fufpended. After this operation it is put into leaden
boilers with iron, to precipitate the copper, and faturate the acidity of the vitriol, where
the water is evaporated for the fpace of twelve or thirteen hours, thence it is conveyed
into bafons to clarify, in which it depofits its fediment: to prevent the too fudden
cooling of the matter, thefe bafons are made of wood coated with clay, and are covered
with planks; in thefe it remains from fix to twelve or twenty-four hours, according to
the gravity of the water; from thefe bafons it runs by means of {pouts into others to cryf-
tallize, wherein it is fuffered to remain fourteen days, at the expiration of which the vi-
triol remains at the bottom, on the fides, and adhering to fticks placed in the bafons; if
any fediment yet remains it is heated anew; the cryftals are laid on an inclined plain
for the water to efcape: the lye or firft matter which is not cryftallized is poured into
awell apart, whence it is taken to be heated again with frefh lye. In order to dry the
cry{tals they are laid on fhelves of four ftories, and in two or three days, according to the
feafon, it is effeted; the quantity of vitriol annually made is eight hundred fchip-
punds,
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