Edwin Thacher's 1881 Slide Rule Patent
Specification forming part of Letters Patent No. 249117, dated November 1, 1881. Includes diagrams.
Internet Slide Rule
Internet port of history's most heavily used advanced calculation aid.
Make Your Own Circular Slide Rule
Templates, directions, and some links to other slide rule sites.
Napier's Bones
A story about the use of a 6-inch Pickett "all-metal" slide rule (Model N 200-ES), with case.
Slide Rule as a Teaching Tool
Examples of how the slide rule is a useful tool for teaching the mathematical concept of transformations. Examples and illustrations.
The Scales of the Slide Rule
Various scales in a convenient tabular form. Includes mathematical formulation of the scales.