RotoGrate Technicolor A colorful boiler is a happy boiler! RotoGrate systems remove ashes from the boiler firebox by revolving the bottom of the system to let the fly ash drop into a hopper. This greatly increases boiler efficiency. Similar Images ...based on the tags: boilers, bokeh, bolts, doors, machinery, rusty, stokers, switches... Spring melt flows down the rusty rock house. In the background is the frame for the shaft. A wounded flour mill, muscled into the corner to keep out of the way. The metallic arms of the missile erector, which would stand rockets over the blast pit in the launch position. Medium Format film–cheap but excellent Fomapan 100 in a Pentax 67. The old way to get to the elevator from the mill. If there were no other options, operators could climb this ladder from the Communications Room to the surface, after opening two heavy steel hatches, of course. An impressive message for graffiti in a Detroit warehouse, but then again look at these steam pumps. Over-built and under-appreciated. The factory’s first aid room and laboratory. Sure makes me wonder how safe the lab was! I wanted to see the third floor to get a better view, but the third floor had already been demolished. The old walls had cascaded down the staircases. This building is gone, now, as you can expect. Note the maps still left on the wall.