I must admit I wanted to write that all that is true but calculating logarithms is difficult but then looked it up and found that slide rule was invented shortl

I must admit I wanted to write that all that is true but calculating logarithms is difficult but then looked it up and found that slide rule was invented shortly thereafter: https://en.m.wikipedia.org/wiki/Slide_rule https://en.m.wikipedia.org/wiki/Slide_rule