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