caused by localized heating and arc flaring the wall of the cooling chamber adjacent the furnace shell comprises a diaphragm or sheet of flexible material which is subject to deformation when the space between it and the furnace shell is evacuated and the sheet is pressed the interface between the diaphragm and shell is coated with a flowable or deformable heat conductive material prior to attachment of the chamber to the furnace so that this material will flow into any void spaces in the interface to thereby enhance thermal conduction application_number US 55741575 A description fig1 illustrates an electric arc furnace to which the new cooling means may be applied the furnace 10 includes an outer metallic shell 11 having a refractory lining 12 in the case of a basic furnace refractory lining 12 may be composed of any suitable basic material such as magnesite or high alumina brick in the case of an acid furnace the lining may be silica brick or ground ganister mix the refractory bottom lining 13 of the vessel is dish shaped and serves as a hearth the hearth supports a molten mass 14 one side of the furnace has an opening 15 through refractory lining 12 and metal shell 11 which opening communicates with a pouring spout that is generally designated by the numeral 16 another side of the furnace has an opening 17 in front of which there is a door 18 that is movable upwardly from the position in which it is shown in fig1 to permit introducing materials into the furnace through opening 17 and to permit raking slag from the furnace interior if desired the furnace also has a cover which is shown schematically and is designated generally by the reference numeral 19 three arcing electrodes 20.