#50427, "RE: Number of windows in Chart room and Pilot's room" In response to In response to 15
I think those are service access to separate sub-sustems. Perhaps different types of water to different decks. E.g. the plumber needs to cut salt water to B-deck or freshwater to A-deck. There are pipes in the web frames of funnel 1 that you don't see in funnel 2. Maybe those are electrical conduits for the ship's clock or telephone lines.
Maybe the crew will have access to one or more or not. Maybe the installers need those control points and then close them up. I don't know. Service test points. I'd like to see a better photo of the inside of that stock hold shaft.
It just seems to me that after the vent grill and whatever those 3 pipe things are (that are so heavily rusted today)you won't get enough usable light reflected from the vent shaft to make it worth the trouble of putting in a window for light. You have a deadlight overhead. My thoughts.