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Acheson Graphite acid advantage American Bridge Company arc furnace arrangement BAILY ELECTRIC FURNACE bath Baur blast furnace brick cables capacity carbon charging door circuit connected construction consumption copper cost crane crucible design designed DETROIT ELECTRIC efficient elec electric melting furnace electric steel furnace electrical equipment electrode holders furnace hearth furnace shell furnaces are built furnaces operate graphite electrode graphite resistor gray iron heat treating Heroult high speed steel installation iron ladle lining manufacture means melting and refining metallurgical minimum molten motor nace nickel silver Open Hearth Furnace plate pouring power factor proper radiation reactance reducing refractory regulation RENNERFELT resistance rockers roller bearings roof Rotary Furnace Rotating scrap shape sizes slag smelting spout standard steel castings Stobie struction Super Greaves-Etchells Swindell switch temperature tion tons tool steel top electrodes trans transformer trodes trough type of furnace vertical voltage voltaic arc watercooled