Musicians simply must know their scales and he came up with a papercraft slide rule for major and minor scales. The system is very easy to use. He’s uploaded PDF files that let you print out the ...

Firms in the United States, Europe, and Japan made millions of the objects, and slide rule cases that attached to a belt loop were as common a sight on the hips of technical students in the 1950s and ...

But [Mathologer] discusses a recent Reddit post that explains a circular slide rule-like device using a wheel and a stretchable rubber band. While it probably would be difficult to build the ...