They are of no great size and are made of fire-clay slabs or even iron plates when the enamel is soft.
Gannister and fire-clay, also, are found in abundance in the vicinity.
Other industries include bleaching, silk-weaving, fire-clay and enamelling works, and a sanitary appliances factory.
So in a furnace which has to be lined with fire-clay that is about the limit.
They must have suspected that it was fire-clay and that you had found a deposit of value.
Today no coal is mined there save for the fire-clay industry or other immediate local use.
Cutlery and tools are largely manufactured, and there are coal-mines, paper mills and iron and fire-clay works.
This is lined with fire-clay or some suitable heat-resisting material.
fire-clay dust in waterglass is used in the Museum at Breslau.
Table 13 shows that the cement pipe cost much less than the vitrified tile, or "fire-clay" pipe.