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Cake day: June 20th, 2023

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  • Deestan@lemmy.worldtoAutism@lemmy.worldInfo dump thread
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    5 days ago

    The “Proportional-Integral-Derivative Controller”, known as PID controller, is used to balance a million things like drone motors, air contitioners, assembly line robotic arms, and chainsaws.

    It can be made to work electronically, pneumatically, or mechanically.

    It - and partial versions of it (like a PD Controller) - was independently invented multiple times throughout history:

    • windmills in 17th century france to regulate pressure based on wind speed
    • factory steam engines to regulate fuel consumption based on load (Centrifugal Governor - invented twice)
    • the 19th century Whitehead Torpedo to reach and maintain depth
    • tons more, I forget






  • I oversimplified a bit! Sorry!

    Words always shift over time and borders. The words “recu” and “receive/receipt” are pretty close and used to be closer. To be more accurate it was “receite” when they adopted it from French. Compared to Latin “recepta” which has a hard P in it. So adding “P” from Latin to the spelling as “receipt” but leaving the pronunciation as Anglo-French “receite” was the most silly part.



  • English is a hilarious mess. The word “receite” originated from Latin but came to England through France at which point it had mutated to modern pronunciation as “recu”, so they shoved a few extra and silent letters in there and spelled it “receipt” to pretend they got it from Latin even though they kept pronouncing it more French.