Furnace lid, fireclay, possibly French, 1926-1927 Furnace lid, fireclay, possibly French, 1926-1927 1926-1927
Two specimens of each of refractory materials: ZAC 1681, ZAC 1711, SILICA, Fireclay, Zircon, Sillimanite Two specimens of each of refractory materials: ZAC 1681, ZAC 1711, SILICA, Fireclay, Zircon, Sillimanite
Furnace lid, fireclay, possibly French, 1926-1927 Furnace lid, fireclay, possibly French, 1926-1927 1926-1927
Furnace lid, fireclay, possibly French, 1926-1927 Furnace lid, fireclay, possibly French, 1926-1927 1926-1927
Furnace lid, fireclay, possibly French, 1926-1927 Furnace lid, fireclay, possibly French, 1926-1927 1926-1927