Bill Phillips built a water based machine to track money in the British economy

I see that Bill Phillips has been mentioned previously in r/discworld but NPR has an article today on the economist and it mentions his 1949 pseudo-Glooper.

https://www.npr.org/sections/planet-money/2026/04/07/g-s1-116575/how-bill-phillips-used-flowing-water-to-model-the-economy