That is the silver addition gadget from Mark Osterman's GEH darkroom. There are a lot of much simpler ways to add silver to an emulsion, but I absolutely love the look of the thing! Off and on I wonder if it couldn't be used as a hook to tie emulsion making into the Steam Punk culture. Mark's emulsion recipe comes from just about the era the culture parodies. Unfortunately, my marketeering creativity totally breaks down when I start to imagine all the Steam Punk things that you could fit your darkroom with! On top of Mad Scientist culture, maybe?? The mind boggles.
Yes, it is Mark Ostermans' Steam Punk gadget. Through this thread I got the technical term for what it is, and then I remembered you had some description of the stopcock buret. So I am going to get one of these. Or two.
Good call on the Steam Punk angle - maybe that is the way?
BTW, darkroom is getting closer now. Some things are starting to fall into place.
Do your work, then step back. The only path to serenity. - Lao Tzu