This is a guitar amp by renowned steampunk craftsman Jake Von Slatt. The amp started life as a Crate 1215 tube amp, bought on Craigslist. The main cabinet is a 1930's radio rescued from the trash. The project is for the guitarist Nathaniel Johnstone, and you can see it in action at the Carnivale Mechanique at this year's Maker Faire in San Francisco.
The steel vessel underneath contains the distilled essence of Robert Johnson