This was from a little display entitled 'Henry Ford and Thomas Edison's Enemies and How They Were Crushed'. Well, not exactly, but Edison hated Tesla. I think that may be why Tesla's death mask seems to be on display here. Next best thing to his head on a lance.
Tesla was pushing AC for powering homes, and Edison was pushing DC, even though it was very impractical. It's always funny when you find out about some 'forefather's' real personalities after being taught something different when you're in school. In short, Edison was pretty much a dick.