To prevent thermal shock from molten aluminumthe tapping pots must be preheated. - Specially constructed assemblies of Chromalox Electric Tubular Elements are attached to vertical supports welded to a 1/4-inch steel cover plate. A hook welded to the plate permits easy transport by crane for lowering and removing the assemblies. Eight Chromalox Electric Tubular Elements rated at 1075 watts each are used in each assembly. The elements are formed in half circles with right-angle bends at the ends where they enter two opposite vertical boxes and are then led out to a terminal box on the cover.

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