Industry & Technology -line art (w4) Iron and steel making Illustration An early 19th century blast furnace - a furnace used to smelt iron ore in very high temperatures by using very hot compressed air.

Industry & Technology -line art (cc4) Iron and steel making An early 19th century blast furnace (c. 1831) - a furnace used to smelt iron ore in very high temperatures by using very hot compressed air.

Industry & Technology -line art (cc4) Iron and steel making Illustration An early 19th century French blast furnace - a furnace used to smelt iron ore in very high temperatures by using very hot compressed air.

Industry & Technology -line art (cc4) Iron and steel making An early 19th century blast furnace (c. 831) - a furnace used to smelt iron ore in very high temperatures by using very hot compressed air.

Industry & Technology -line art (cc4) Foundry Iron making The wall of an early 19th century blast furnace - a furnace used to smelt iron ore in very high temperatures by using very hot compressed air.

Industry & Technology -line art Iron and steel making A 19th century forge Illustration General view of rolling iron.