a contrivance for blowing the fire, for the fusion of ores, without bellows, by means of water falling through a funnel into a close vessel, which sends from it so much air or vapour as continually blows the fire. If there be the space of another vessel for it to expiate in by the way, it there deposits its humidity, which otherwise might hinder the work. This contrivance was named camera aeolia by Kircher.