HOW TO USE A SLIDE RULE (C&D SCALES) ANALOG COMPUTER MULTIPLICATION & DIVISION
https://www.youtube.com/watch?v=rJKmc4PVdh4&ab_channel=PeriscopeFilm
In Israel we were all still trained with slide rules, and still are, assuming that, during our lifetime there will be a major EMP attack, destroying computers.
Can’t say people are proficient, but they are familiar enough the learning curve would not be so steep.