Heat-resistant block, refractory ring, or hollow
sheet-metal box, 150 to 175 mm in diameter if round, or on
a side if square, 32 to 38 mm in thickness, provided with a
metal-lined, inverted cone-shaped opening through the center;
83 mm in diameter at the bottom, and 89 mm in diameter at the
top. In the case of the refractory ring no metal lining is
necessary, providing the ring is of hard, heat-resistant material
Heat-resistant block, refractory ring, or hollowsheet-metal box, 150 to 175 mm in diameter if round, or ona side if square, 32 to 38 mm in thickness, provided with ametal-lined, inverted cone-shaped opening through the center;83 mm in diameter at the bottom, and 89 mm in diameter at thetop. In the case of the refractory ring no metal lining isnecessary, providing the ring is of hard, heat-resistant material
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