Although, as I am sure you know, these 'water
dimmers' were used (in my
lifetime, just) for full-sized theatre lights, running directly off the
mains. Topping them up when live was dangerous. As was finding the darn
things nearly boiling during a play.
What reasons for using water dimmers and how big they're like?
What very interesting time!
Cheers,
Wizard
-tony