Hydraulic Bellows

Hydraulic Bellows is a form of Technology and Culture.

Description
The temperatures required to melt metal in a blast furnace can only be reached by supplying a constant flow of air via large bellows worked by men or oxen. However, with a suitable mechanism, they may be powered with a water wheel, greatly increasing the air supply, and thus the quantity of metal that may be melted.

Effects

 * Increases value of iron and steel trade by 100%