If I remember correctly, I think the compost tumbler at the Franklin Conservatory was a sphere. The support that the sphere sat in allowed the sphere to be pushed any direction. Also it was about 18" off the ground so I imagine taking off the door and spinning the tumbler so the door was positioned down would get most of the compost out.
Similar to this
http://www.hamptons.com/galler... but the one I saw was still slightly different. Looks like there are several spherical shaped tumblers. My design job is not needed.
