This kind of thing is really strange. The situation is surprisingly good.
He observed the pottery fired with this clay and believed that they were extremely resistant to high temperatures.
Thus, he used this clay to make containers, carving grooves on them to facilitate the outward flow of molten metal.
He dug holes on the side of the kiln to guide the molten metal to flow down.
He believed that his furnace could reach temperatures of just over eleven hundred degrees with the use of bellows, which was sufficient for firing pottery and also feasible for smelting pig iron, but unable to melt the pig iron into molten iron.
But now, using these stones to smelt iron can produce liquid metal.
He thought that the stone itself contained unknown chemical components and generated heat during smelting, raising the overall temperature, thus enabling the production of molten iron.
In the next furnace, he used the molten metal to cast a sixty-one-centimeter-long knife.
