I think the fellow is wearing gaiters that were issued in the last years of the war to save boot leather. The cap does also indicate that time. Three buckles per gaiter would be o.k, I think. but I've never seen any shiny like that.The soldiers cap looks German, but the boots?
Well, if it's the mirror is from a 200 cm searchlight anything else will necessarily look a bit bigger than usual.But it looks somewhat monsterous to be a piece of test equipment.
I'm not totally convinced that both wheels would turn the "mirror" and the "thing" around the horizontal axis. The big wheel could also be for turning around the vertical axis. Power transmission from the big wheel to that axis should be a simple task for a mechanic. (Admittedly there seems to be another hardly recognizable wheel on vertical axis.)My question is why can the mirror and "The Thing" elevate independently.
Best regards
Torsten