Comment on Tesla Patent Don't multiply, add. It saves time and energyComments−ReptileMan7moMy mother has used such manually operating machine in the late 60s. It was called the slide ruler or something.−defrost7moMine also.Truly what goes around, comes around: https://www.instructables.com/Circular-Slide-Rule/
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My mother has used such manually operating machine in the late 60s. It was called the slide ruler or something.
Mine also.
Truly what goes around, comes around: https://www.instructables.com/Circular-Slide-Rule/