Natural draft furnace iron smelting
13
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Building a furnace insulated with wood ash to smelt iron in
31 votes -
Making iron bacteria cement (water insoluble, no firing required)
13 votes -
The blast furnace - 800 years of technology improvement
5 votes -
Smelting iron from iron-oxidizing bacteria and then casting it in a mold to form a rudimentary knife
7 votes -
The enormous hole that whaling left behind
9 votes -
Iron, how did they make it? Part I, Mining
8 votes