Rotary frit kilns are large refractory-lined cylinders, which have a burner (gas or oil) that passes through them. From Wordnik.com. [7. Frits and fritmaking] Reference
An electric arc furnace used for steelmaking consists of a refractory-lined vessel, usually water-cooled in larger sizes, covered with a retractable roof, and through which one or more graphite electrodes enter the furnace. From Wordnik.com. [Archive 2008-03-23] Reference
The roof, which may be refractory-lined or water-cooled, and can be shaped as a section of a sphere, or as a frustum conical section. From Wordnik.com. [Archive 2008-03-23] Reference
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