"It's a sort of a bucket made of fire clay," answered Frank.
I claim, 1st, Constructing the air pipe of a furnace-blast heater of fire clay, substantially as described.
A stratum of fire clay commonly underlies a coal seam, and there occur also beds of iron ore.
When cracks appear or96 joints open, they should be stopped with a pugging of fire clay and grog.
The presence of fire clay beneath a seam points in the same direction.
The coal is put in retorts, r, commonly made of fire clay and often of cast iron.
The making of rough saggars is not difficult if a supply of fire clay is to hand, or clay and grog will serve at a pinch.
They are covered with fire clay, which is destroyed after one or two ladlings and has to be knocked off and replaced.
The furnaces were mere pots built of fire clay brick, and filled with coal or coke beneath and iron ore on top.
Even now the capabilities of Stourbridge fire clay are not generally understood.