We have no meanings for "refractory clay" in our records yet.
1 This reflector terminates above in a dome, in whose center is placed a refractory clay box.
2 The muffles are made of refractory clay .
3 This is placed in a second larger crucible of refractory clay , and the intervening space filled with lampblack tightly packed.
4 The sides of the crucibles are covered with a thin layer of refractory clay , and their bottoms have a spherical concavity to hold the bloom.
5 A very elaborate display of kaolin-plastic, vitrifying, and refractory clays - was made .
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