re: #707 Kosh’s Shadow

It adds logarithms, which means it multiplies.
Here is a site on them
Used before the days of electronic calculators. Wearing one on the belt was the badge of a geek.
Reminds me, I still have a circular one I used in high school. When I’m famous, it will be in a museum somewhere…..

Let us not forget the venerable Curta … vcalc.net