We had this conference in Chicago in 2016. As I was playing with the laser-cutter and making planetary motion devices see Here, I also was playing with the idea of circular slide rulers. As the calculation of elution volumes and retention in CCC and CPC are using multiplications and divisions it is possible to do these on a circular slide ruler (or a normal one) by using logarithmic scales (because additions in that space correspond to multiplications in linear scale).

We had this conference in Chicago in 2016. As I was playing with the laser-cutter and making planetary motion devices, Guido asked if it wouldn’t be possible to make two awards for the conference. I also made a Slide ruler for that conference. A bit of design, metallic-gold acrylic, flexible metallic with black background acrylic for the tag, and a piece of wood made by a colleague (Jim).

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