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Old 04-01-2010, 12:30 AM
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mithrandir (Andrew)
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Join Date: Jan 2009
Location: Glenhaven
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Tradeoff? The cost and weight of a solid blank would be prohibitive. It could be drilled to reduce the weight, but that would just increase the cost.

The glass pillars and the back must have the same thermal properties as the mirror, which other materials wouldn't.

I would have thought that having some radially aligned strips with intermediate pillars would be more vibrationally stable, but I'm not a materials physicist.
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