Cast Room Controller - The Carrie Furnace
The controller for the drill that was used to punch a hole in the bottom of the Carrie Furnace in oredr to release the molten iron is seen here.
Cast Room Controller
This photograph was taken in a room protected by metal walls. This is where the foreman would use a drill controlled by the device in the photo to open the furnace and drain the molten iron.
The audio segment also describes this, as well as how the furnace was closed again after it was drained in order to continue the process of iron production.