The making of iron (from an ore)
Fining iron ore to make wrought iron from pig iron. The righthand illustration shows men working a blast furnace (Tiangong Kaiwu encyclopedia, 1637).
The making of iron (from an ore)
An illustration of furnace bellows operated by waterwheels, from the Nong Shu, by Wang Zhen, 1313 AD, during the Yuan dynasty in China