I inherited and know how to use a couple slide rules, including a spiral one that’s 46 feet long (1). But if I need to actually calculate something, I use a RPN

I inherited and know how to use a couple slide rules, including a spiral one that’s 46 feet long (1). But if I need to actually calculate something, I use a RPN calculator. Or Python. (1) https://www.sliderulemuseum.com/Circular/Gilson_Atlas_Calculator_Type1_SquareAluminumPlate_1922_TomDilatushCollection.jpg https://www.sliderulemuseum.com/Circular/Gilson_Atlas_Calcul...