Back in 2008 Instructables member legionlabs
published "How to use a slide rule
." In the comment section Instructables member Mr ross
made reference to a May 2006 article in Scientific American
magazine titled "When Slide Rules Ruled." Once that article was available on-line in PDF, but has since been removed. Scientific American still makes it available, but at a cost of about $7 US. The article included a downloadable PDF file
pictured in the graphic for this step. It is a printout for a fold-up paper slide rule. I decided I wanted to make one of these just for fun, but mount it on wood and Plexiglass. After printing the PDF file, I enlarged it with a copy machine to about 150%. The idea was that the scales would be larger, easier to read, and more precise.