The sketch herewith gives a sectional view of a crucible steel furnace. The melting chamber A should be 3 ft. high from the grate bars B, oval in shape, 26in. by 19 in., and lined with 6-in. ganister. The flue E leads from the melting chamber A into the chimney stack F. The cold-air flue M leading from the cellar D is used to regulate the draught. The chimney stack F, lined with firebrick, should be from 35ft. to 10 ft. high. K is the cover of the melting chamber; I the shelves for drying crucibles; N the chamber behind the stack for drying crucibles, storing charcoal, etc.; and Z, Z the annealing ovens.

Crucible Steel Furnace.