Mill Controls Though it’s a little unclear what control station controlled what function, these levers seemed to relate to some of the bigger equipment inside the dredge, such as the trommel. Similar Images ...based on the tags: buttons, control-panels, grates, levers, shadows, squares, staircases... Exploring Dock 4 was a very different experience, since it was almost all metal. The remains of the site radar beside the command building. Looking through the trestle toward the ghost town. The hoist room, before it was used for storage. The roof compromised, rain water rolls down the main stairway. A typical building from the expanded starch line. Sunbeams under the sintering belt. Support cradles for the wires crossing the factory are falling down. A self portrait from more than a decade ago. A staircase threads between the top floor and the sluices, which are in the middle of the dredge-mill.