Crucible
Even hotter topic
<&crucible>
Crucible is a more advanced smelting equipment than the original blast furnace, coke coal must be used for heating.
You must also provide a <link;improved_blast_furnace;blast furnace preheater;preheater> at the only small opening.
If everything is correct and fuel is inserted, indicator in the bottom left of UI would light up.
Ingredients can be inserted from the top, products can be exported from side, fuel can be inserted to the burning chamber in the bottom.