Abstract: An induction crucible furnace for the smelting of materials comprises a crucible which is surrounded by the induction coils and yoke which are mounted upon an intermediate vessel or shell closed by a cover overlying a mass of insulating material interposed between the crucible and inductor and the shell. The intermediate shell has an outwardly extending support flange by which it is mounted on an outward flange of the outer housing with clearance, the clearance likewise being filled with insulating material through openings formed in the flange of the intermediate shell inwardly of the wall of the housing. The flange of the latter projects beyond the flange of the intermediate member and a cover is connected to the housing flange to hermetically seal the system.