Stone furnace

Stone furnaces are a very basic smelting building providing a cheap and reliable source of basic products like iron plates or copper plates.

Recipe:	5 + 1 => File:Stone-furnace.png 1
Smelting speed:	0.5
Max energy:	180 W (burner)

Interface

Interface of a Steel furnace(same as Stone furnace).

1. Resources and stock
2. Current smelting progress
3. Finished products
4. Current Fuel, remaining stock, and time when next item is removed from stock.

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