Sulphur was obtained in a variety of ways during the 18th century. Sulphur could be mined, it could be found on the surface having been deposited there from sulphur springs or from gasses escaping from deep in the earth. Sulphur was produced in England, America & overseas in Asia & Europe.
Sulphur springs in Yellowstone Park America.
Sulphur mine in England.
Sulfur found naturally on the ground from the island of Vulcano in Italy.
Mined sulphur in rock form.
Spelling and etymology
Sulfur is derived from the Latin word sulpur, which was Hellenized to sulphur. The spelling sulfur appears toward the end of the Classical period. (The true Greek word for sulfur, θεῖον, is the source of the international chemical prefix thio-.) In 12th-century Anglo-French, it was sulfre; in the 14th century the Latin ph was restored, for sulphre; and by the 15th century the full Latin spelling was restored, for sulfur, sulphur. The parallel f~ph spellings continued in Britain until the 19th century, when the word was standardized as sulphur. Sulfur was the form chosen in the United States, whereas Canada uses both. The IUPAC adopted the spelling sulfur in 1990, as did the Nomenclature Committee of the Royal Society of Chemistry in 1992, restoring the spelling sulfur to Britain. Oxford Dictionaries note that "in chemistry and other technical uses … the -f- spelling is now the standard form for this and related words in British as well as US contexts, and is increasingly used in general contexts as well."