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It’s really “pitch”, but I can’t make a case for being that pedantic
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The beam loses 3.5 W per meter of path length
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Convincing the targeting dot to go backward through the mirrors to the retroreflector
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The general idea is to make it very difficult to inadvertently press that button
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Allowing single LEDs to go dark without affecting the rest
The Smell of Molten Projects in the Morning 