Five important files providing a detailed background to Long Scale Rules

A Homage to Long Scales or When Size Does make a Difference!	David Rance
Long-Scale Slide Rules: From Words to Scales - Part 1.	Jose Fernandez
Long Scale Slide Rules	Edwin J. Chamberlain
Long-Scale Slide Rules Revisited	Edwin J. Chamberlain, PE
Circular Slide Rules with Very Long Scales	Edwin J. Chamberlain, PE