Gantry Crane Control A long exposure in the crane cab at sunset throws a bit of color into the bleak yellow glows between the windows and car shaker. Related Similar Images ...based on the tags: control-rooms, cranes, grimy, levers, stained-glass, tracks, windows... This bay would host boxcars as workers would fill them with the fruits of the factory. The sidewalks are littered with rocks. Note the rails in the floor that guided cars to the coating line, the side of which is lined with the windows in the center of the image. A cloud moves across the attic in front of the window. How? A photographer’s secret. 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. On first impression it might look like a funky mailbox, but trust me on this one; it’s a flour bolter chute. In flour milling, “bolting” means sifting the flour through successively smaller screens. In the basement were all the valves to control the flow of municipal steam through the building. This hasty hand letting was beside one such valve, near a carved brick with a name and ‘1934’ under it. Dust explosions were a real risk for grain mills. These funnels helped to filter the air in the mill. One level below where the cotton was nitrated, the fumes must have been powerful. This floor had several massive ventilation fans in its walls.