Definitions of furnace

  1. To throw out sparks as a furnace.
  2. An inclosed place in which heat is produced by the combustion of fuel, as for reducing ores or melting metals, for warming a house, for baking pottery, etc.; as, an iron furnace; a hot- air furnace; a glass furnace; a boiler furnace, etc.
  3. A place or time of punishment, affiction, or great trial; severe experience or discipline.
  4. To throw out, or exhale, as from a furnace; also, to put into a furnace.
  5. An inclosed structure where coal, wood, and other things are burned to make heat.
  6. A time or place of grievous affliction or torment; as, the furnace of affliction: a place where a vehement fire and heat may be made and maintained, as for melting ores or metals, heating the boiler of a steam- engine, warming a house, baking pottery or bread, and other such purposes. Furnaces are constructed in a great variety of ways, according to the different purposes to which they are applied. In constructing furnaces the following objects are kept in view:-( 1) To obtain the greatest quantity of heat from a given quantity of fuel. ( 2) To prevent the dissipation of the heat after it is produced. ( 3) To concentrate the heat and direct it as much as possible to the substances to be acted upon. ( 4) To be able to regulate at pleasure the necessary degree of heat and have it wholly under the operator's management. An air furnace is one in which the flames are urged only by the natural draught; a blast furnace, one in which the heat is intensified by the injection of a strong current of air by artificial means; a re- verberatory furnace, one in which the flames in passing to the chimney are thrown down by a low- arched roof upon the objects which it is intended to expose to their action.
  7. A structure enclosing a fire chamber, as for smelting or heating.
  8. Any enclosed fire- place in which to produce a violent heat, for melting ores, metals, & c.; a situation of severe affliction, conceived as sent to purify.
  9. An enclosed fireplace for obtaining a high degree of heat; grievous afflictions.