Get something from K&E on eBay. And Read Asimov's book on how to use a slide rule https://www.sliderulemuseum.com/Manuals/M220_AnEasyIntroductionToTheSlideRul

Get something from K&E on eBay. And Read Asimov's book on how to use a slide rule https://www.sliderulemuseum.com/Manuals/M220_AnEasyIntroductionToTheSlideRule_IsaacAsimov_1965.pdf https://www.sliderulemuseum.com/Manuals/M220_AnEasyIntroduct... It's a fascinating instrument, and a lot of cleverness is involved in the choice of scales, plus precision manufacturing. Asimov will show you how to make your own simple slide rule. Slide rules work because of One Weird Trick -- Addition via sliding one member across another. It's just a question, then, of WHAT one is adding (or subtracting, which is just negative adding). do have fun, I have a small collection, because, you know, nerd.