Pretty rich, eh? Ebay is a good place to explore the arcane... or simply the interesting! One can also learn about the contractor who built the interesting concrete shell of the McDonnell planetarium (St. Louis). To paraphrase "Fletch": "It's all timing belts these days".
Iowa City, IA
Iowa Space Science Center project
Other Projects: Science education, Spitz A4, Home-built planetarium
(6.35 limiting mag); single fisheye digital projection system. Spitz 373,
and the Spitz Jr.!