Archive image from page 618 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 XII. 581 -High walls. CâLow walls. DâPlates. EâUpper pots. FâLower pots. The sulphur from such a mixture can best be extracted if the upper pots are placed in a vaulted furnace, like those which I described among other metallurgical subjects in Book VIII., which has no floor, but a grate inside; under this the lower pots are placed in the same manner, but the plates must have larger holes. Others bury a pot in the ground, and place over it another pot with a hole at the bottom, in wh
Archive image from page 618 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 XII. 581 -High walls. CâLow walls. DâPlates. EâUpper pots. FâLower pots. The sulphur from such a mixture can best be extracted if the upper pots are placed in a vaulted furnace, like those which I described among other metallurgical subjects in Book VIII., which has no floor, but a grate inside; under this the lower pots are placed in the same manner, but the plates must have larger holes. Others bury a pot in the ground, and place over it another pot with a hole at the bottom, in which p3'rites or cadmia, or other sulphurous stones are so enclosed that the sulphur cannot exhale. A fierce fire heats the sulphur, and it drips away and flows down into the lower pot, which contains water. (Illustration p. 582). Bitumen is made from bituminous waters, from liquid bitumen, and from mixtures of bituminous substances. The water, bituminous as well as The substances referred to under the names bitumen, asphalt, maltha, naphtha, petroleum, rock-oil, etc., have been known and used from most ancient times, and much of our modern nomenclature is of actual Greek and Roman ancestry. These peoples distinguished three related substances,âthe Greek asphaltos and Roman bitumen for the hard material,â Greek â pissasphaltos and Roman maltha for the viscous, pitch}/ varietyâand occasionally the Greek naphtha and Roman naphtha for petroleum proper, although it is often enough referred to as liquid bitumen or liquid asphaltos. The term petroleum apparently first appears in Agricola's De Natiira Fossilium (p. 322), where he says the ' oil of bitumen . . . now
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