Electric arc furnace.
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Previously:
https://www.homemadetools.net/forum/...890#post148654
https://www.homemadetools.net/forum/...817#post179081
https://www.homemadetools.net/forum/...347#post146386
https://www.homemadetools.net/forum/...026#post176121
https://www.homemadetools.net/forum/...931#post148785
