#furnace  an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.
  supertype:  #chamber  a natural or artificial enclosed space
  part:  #grate.framework  #register.regulator
  subtype:  #blast_furnace__blastfurnace  a furnace for smelting of iron from iron oxide ores; combustion is intensified by a blast of air
  subtype:  #cremation_chamber__cremationchamber__crematory__crematorium  a furnace where a corpse can be burned and reduced to ashes
     subtype:  #gas_oven.cremation_chamber__gasoven  a cremation chamber fueled by gas
  subtype:  #cupola.furnace  a vertical cylindrical furnace for melting iron for casting
  subtype:  #electric_furnace  any furnace in which the heat is provided by an electric current
     subtype:  #Stassano_furnace__electric-arc_furnace  an electric furnace in which an electric arc provides the source of heat for making steel
  subtype:  #firebox  a furnace (as on a steam locomotive) in which fuel is burned
  subtype:  #forge  furnace consisting of a special hearth where metal is heated before shaping
  subtype:  #gas_furnace__gasfurnace  a furnace that burns gas
  subtype:  #incinerator  a furnace for incinerating (especially to dispose of refuse)
  subtype:  #oil_burner__oilburner__oil_furnace__oilfurnace  a furnace that burns oil
  subtype:  #tank_furnace  furnace into one end of which a batch of measured raw materials is shoveled and from the other end molten glass is obtained

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