A circular slide rule.

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   blinry (blinry@chaos.social)'s status on Monday, 27-May-2024 19:59:49 JST blinry

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   I also visited University of Oxford's Museum of Science, which showcases a lot of scientific instruments, including some super pretty and old astrolabes!

   The museum didn't do a good of explaining how to use them, though. Need to look into that later tonight, maybe! :)