Burdinaren lorpenaren irudiak (Labe garaiak)

http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_30.gif

http://www.solarnavigator.net/history/explorers_history/iron_making_blast_furnace.jpg

http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/T045421A.gif

http://i.pbase.com/u41/clements/large/39549963.ins_S_furnace_3898.jpg