A means of blow air into a furnace. Bellows are very rarely preserved in the archaeological record. The main evidence of the various types that could have been used comes from historical or ethnographic sources. Types of bellows that could have been used were :- the pot bellows, bag bellows, box bellows as well as the ‘normal’ smiths bellows. Initially, bellows were hand or foot powered. With the introduction of water-powered bellows furnace sizes and temperatures could increase if suitable refractory materials were available.