Page:Popular Science Monthly Volume 26.djvu/509

Rh but merely change it from a solid to a liquid state by the action of their heat, carbon bisulphide actually dissolves the sulphur and re-deposits it by evaporation. The plant necessary for carrying out this process is shown in Fig. 5. It is designed of dimensions suitable for dealing with twenty tons of raw sulphur mineral per diem, yielding fifty per cent of pure sulphur. The four extracting pans, a, b, c, d, have each a capacity of five tons, and are made of three-eighth inch



wrought-iron plate; they measure six feet long, four feet wide, and four feet deep internally; and are fitted with a perforated bottom diaphragm, with connecting pipes, m, leading to the underground solution-tank, f, with another set of pipes, k; for admitting steam from the boiler, i, and with a third set of pipes, l, communicating with the store-tank, g. The still, e, is a steam-jacketed "wrought-jacket" pan, six feet long, four feet wide, and four feet deep, with cast-iron ("loam casting") oval-shaped bottom and ends, one-half inch thick, and