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Must be in the air, I just watched a YouTube recommended vid by Mathologer on the circular slide rule that was interesting. https://youtu.be/ZIQQvxSXLhI https:/

• szszrk 5y ago
  I love that it's still used in watches. Some brands have it build into watches bezel, with some predefined marks for popular conversions like galons/liters, miles/nautical miles/kilometers and so on. It looks fun and is fun. Of course the rule itself is very limited as you basically have to figure out where is the decimal point by yourself (even for small numbers) but it's actually very precise and may be useful with practice. Below some examples that are not very expensive [1], also a Casio manual [3] I found very helpful and visually appealing. [1] Seiko SSC632, Seiko SRPB59J1, Casio EF527D-1AV [2] https://support.casio.com/answer.php?rgn=4&cid=002001009001&qid=24394&num=1 https://support.casio.com/answer.php?rgn=4&cid=002001009001&...
• function_seven 5y ago
  Definitely in the air. I just watched that video last week and was blown away by the rubber band analogy. So simple and intuitive what's happening as the wheel takes up the infinitely-stretching rubber band. I always thought I understood logarithms—and I actually did somewhat—but that visual really drove home the "continuous ratio-ing" that's happening as the scale is built.
• perilunar 5y ago
  > Must be in the air Ha. The famous E6B flight computer is a circular slide rule. Edit: it's mentioned in the video.