Pressure Puller Captured bolts for a pressure cooker on an industrial scale. Related Similar Images ...based on the tags: bolts, circles, rusty... Looking across the catwalk attache to the elevated control room, in charge of the train dumping part of the operation. One of the many blast doors. Note the plunger to seal off the airflow in the event of an attack or accidental explosion. This ruined skyway looks like it should be at ground level because of the growth, but it’s actually the second floor of the building. “What’s that diamond thingy on the Pilot House?” you ask? It’s a 1920s-era radio transmission direction finder, a pre-radar navigation aid. Lit with diffused flash. In the grungy control room, I found a little slice that was never graffitied. The rear of the complex shows the more than 100 year old workhouse–still working! I do not know if the tanks are original to the 1901 elevator, but I suspect so. Blue plastic siding filters the summer sun, giving the otherwise reddish-brown interior a splash of color. A closeup of a flour chute.