Cooley's Cyclopædia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I

by Arnold James Cooley; Richard Vine Tuson

they were heated. At the present time the process is commonly conducted in a ‘reverberatory furnace,’ similar to that figured in the engraving.

a, b, Grate and fire-place.

c, Bridge.

e, Concave space for ore formed by a solid bed (f) of clay and sand, and having a ‘hole’ near the bottom extending nearly horizontally through the wall of the furnace to ‘run off’ the fused sulphide.

g, Door for introducing ore, and removing residuum.

h, Chimney.

i, Damper, chain, and lever.

Native trisulphide of antimony treated in this way and ground to powder constitutes the BLACK ANTIMONY (ANTIMONIUM NIGRUM), B. P.

Antimony, Trisulphide of (artificially prepared). Saturate an aqueous solution of tartar emetic with hydrosulphuric acid; an orange precipitate will be thrown down. This precipitate, when collected on a filter, washed, and dried, is the pure trisulphide.