Rolling Thing #12

I didn't find much use for Rollyo. Although I think it would make a good name for a cereal. My Rollyo search roll is at the bottom of the right column. Learn everything you want about the Curta Calculator, the most boring, manual calculating machine ever invented. I think the inventor is probably more interesting than the machine he came up with. Curt Herzstark designed it while he was a prisoner in Buchenwald concentration camp during World War II.