Spray Pond The rocket system used several cooling methods, once of which included an evaporation pond, pictured here. Related Similar Images ...based on the tags: fences, fountains, sepia, water, yellow... The whole smelter ran on gravity… elevating the various raw materials and working with them until at the bottom of the furnace, copper poured out. A long tunnel stretches toward the Mississippi. Was this the route Model Ts took on their way to waiting barges? The Sivertson’s sign seems like from a different time. I’ve never seen it lit, but I bet it’s beautiful. Inside the pilot copper concentrator. One of the underground creeks in Duluth, somewhere under the East Hillside neighborhood. Spring melt flows down the rusty rock house. In the background is the frame for the shaft. When I saw this section, I knew the dock was abandoned. The back door into the old distillery building. Not castle-like at all, sadly. The chief engineer had many phones. It’s my guess one connects to the pilot house and the other connects to the emergency steerage station that’s mid-deck.