Furnace
A suitably provided chamber where fire is produced by the use of fuel, as for melting metals, smelting ores, etc., the former being a cupola, the latter a smelting furnace. When the fire receives no other support than a natural draught, it is termed a wind or air furnace; when a forcible current of air is injected by means of a fan, blower, or engine, it is a blast-furnace; and a reverberatory furnace when the flame in passing through towards the chimney is thrown down by a low arched roof upon the materials to be operated upon. See CUPOLA; REVERBERATORY FURNACE; BLAST-FURNACE; BRASS-FURNACE; also many other furnaces, in their respective order.