This intriguing scientific device comes from a dusty trunk found in the estate of Professor Gould Zaius.
You can see more of the Accumulator, and a number of other steampunk creations, at Cornelius Sagan's photostream on Flickr. What I really like about this particular one is that the found parts aren't readily identifiable. There's a lot of "steampunk" art along these lines that consists of just throwing a bunch of brass bits together, usually consisting of candlesticks and lamp bases, without any real thought.
Via Brass Goggles.