One of our installers recently found this mounted on the t-bar wall of a theatre. it is a hydraulic/pneumatic cylinder. It's not attached to anything. It's in the middle of the rigging wall so I don't think it has anything to do with the Fire curtain <it's not a dash pot>. I'm not positive but I think that round plate is a brake disc.
Guesses? I'd like to see the top of it. It might help figure this out. I'll ask for some more pics and post them if I get them.
Guesses? I'd like to see the top of it. It might help figure this out. I'll ask for some more pics and post them if I get them.