Drawing, iron pot used in the extraction of sulphur from a Swedish stone by Sir Gilbert Talbot Small outline drawing showing the shape of an iron pot used to melt stone in the process of extracting sulphur from it. Associated with the paper 'A description of a Swedish stone, which affords sulphur, vitriol, allum and minium', appears in the margin of page 1 labelled 'C' (see CLP/9i/18/1). Subject: Mineralogy / Chemistry / Industry [1666]