Soviet era military surveying tripod is now a lamp

We found this incredible old tripod and surveying instrument at an antiques sale.  Can't quite figure out what it is, since the only writing on it is a handful of Cyrillic characters which look like nothing more than a serial number.  After talking to a surveying expert, they think it's some sort of "nadir plummet", since the eyepiece looks straight at the ground with a cross hair.  

Anyway, as you can see, I turned it into a lamp by adding a vintage industrial lamp shade with a small flood lamp pointing down over the instrument.  The shade is attached with three aluminum legs,  carefully attached at existing screws, so as not to damage or permanently alter the tripod and instrument.