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Programming by successive approximation may be a thing
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When that happens, the projector is boresighted on the spindle
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As the man said, “E pur si muove.”
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The nice engraved letters come from scribbling a chisel-tip black marker
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The mud-sealed tubes have obvious small holes
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The crossbar tends to flop around while assembling it overhead
The Smell of Molten Projects in the Morning 