Completely irrelevant, but I do believe I once (in the dim mists of antiquity, probably sometime in the early Cretaceous ) saw a binary slide-rule. Wups, admitted I know how to use a slide rule–guess I’ll have to call in the HypnoToad to make you all forget I said that…here, look at this little flashy thingie… .
If you actually have a quality slide-rule, hang on to it; those things are collectors items these days. Although the best one I ever saw was a circular flash-to-bang/yield calculator for a particular mark of nuke. Someone was selling it, along with a bunch of other probably classified weapons stuff on eBay a couple of years ago. Really.