New Member - Many Questions, "pinhole lens" light source - wish list and call for help
Nov 23 2008, 07:28 PM
Joined: 20-November 08
From: Iowa City, Iowa, USA
Thank you for the bulb photos. I think I had info on GE amps 1434 and 1424. I'm assuming that the "bucket" for the bulb is for horizon cut off? The reason I ask is that I'm thinking of a adding a mechanism to my drum -- by keeping the bulb oriented "up", that would avoid my aforementioned problem with the limited projection angle (currently, my bulb position is simply fixed relative to the drum.
Interesting that you mention the us of an arc lamp. Wow. I'm thinking of the old fashioned carbon-rod type (and smoke and all). If you happen to come across discussion of bulb options (and now, my concern of having it mounted in a gravity-oriented gymbal, please let me know. I appreciate your responses. Now a very greedy question -- has it been in your experience possible to pick up such parts at lost cost from planetarium "salvage" operations? I can't imagine that such a thing exists, but I thought I'd ask. I'm a slow designer and builder... if I could ever pick up some hardware (particualrly stuff related to planet projection --- I'd be in heaven -- or at least a more reaslistic one.
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.!
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