Five important files providing a detailed background to Lomg Scale Rules

A Homage to Long Scales
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