astrolabe?
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A ruler
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Ideology detector
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sextant?
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Use those tubes to make a potato launcher, or get smaller tubes to make a marshmallow gun.
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Build an interferometer and do Michelson-Morley
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Did this in college. Here's a step by step: https://www.instructables.com/id/Desktop-Michelson-Morely-Interferometer/ … Sorry for misspelling ghost of Morely
End of conversation
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A Wittgenstein Ruler
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Sine bar. If you're serious machinist, it is a must have.
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Telescope isn't hard.
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