What is it? Set 542

Based on the translations of the words on this device I'm now sure it's for use with some type of artillery, though I couldn't find another one like it on the web. I don't have an answer yet for the brass tool but the rest have been posted here:

Thanks to everyone who answered the piston groove cleaner.

Rob

Why limit the followups to rec.woodworking -- especially since the later information seems to make it a military item -- an (artillery) gunner's protractor, not a woodworking tool?

I've reset the cross-posting as it was intended to be. This is one of the exceptions to setting followups to a single newsgroup, as there are people contributing from all three -- and most people do not

Enjoy, DoN.