Trommel The first step of the filtering process is being spun through this tube. Related Similar Images ...based on the tags: cables, circles, dirty, machinery, pipes, rusty, staircases, trommels, tubes... This building was an office and lounge for engineers. It is also demolished. I like this picture because it shows some of the only unbroken windows at Packard. The Dock 5 sign at track level. Probably as an aid to sailors reboarding their vessels. Looking up the rock house. Looking into the Pool 8 Annex from the original Ogilvie’s elevator. The Engine House’s boiler, which would have been fired all day all day, virtually from the day the shop opened until the day it closed. A close-up look at the distressed, but beautiful, staircase in the brewhouse. Between the gauges for the power plant boilers and the steam pump flywheels. The bottom of the stairs leading from the work floor to the cafeteria.