The Skip I
This photograph shows one of the 'Skip Cars' that were used to bring raw materials to the top of the furnace, where they were dumped into the fiery iron making process. The four large pipes around the top of the furnace are the 'bleeder valves' used to make adjustments to the pressure in the furnace. When the furnace wasn't charged correctly it would spew balls of red hot coke into the facility below.
The audio segment relates some great anecdotes about what happened when the hot fireballs were released.