This is the last of the Emmons star balls (it was sold as a star ball only and never even painted black). Prof. Richard Emmons of Ohio used these hand-drilled, durable 12" steel globes (with about 400 accurately positioned stars and a series of ecliptic holes to allow the projection of the Moon and planets) in a line of small planatarium projectors he manufactured in the early 80's. This projector is designed to be used with domes up to 16' in diameter.
This particular ball is now mounted on a reinforced Lawrence Hall of Science star projector mount (non-motorized, though a dinural drive could be added easily) and has a sturdy plywood carry box that also serves as an artificial horizon.
I used this projector for years in a Starlab dome and it worked quite well, but now due to a club change I no longer have access to a dome. I've decided it is a shame to let this educational tool collect dust when it should be bringing the stars down to earth, so I'm selling it for far less than I paid for it.
I'm asking $125 + shipping vis U.S. Postal money order and I'll include a supply of spare lamps. If you'd like to see a couple of photos of the unit email me and I can send them to you. It's not quite as nice as the Starlab projector, but it is only 1/30 the price!