How to Use a Slide Rule as a Bicycle Gear Chart - Slide rules are useful for doing gear calculations. Briefly describes a method for doing so. Slide Rule Scales - Describes the types of scales found on most slide rules. History of the Slide Rule - Basic facts involving the development of the slide rule. Includes diagrams and links to information on various types of slide rules. Napier's Bones - A story about the use of a 6-inch Pickett "all-metal" slide rule (Model N 200-ES), with case. Basic Slide Rule Instructions - Explains how to multiply, find cube and square roots and other operations. Includes illustrations. Edwin Thacher's 1881 Slide Rule Patent - Specification forming part of Letters Patent No. 249117, dated November 1, 1881. Includes diagrams. How To Make a Slide Rule (or Log-log or Semilog Graph Paper) - Fairly simple instructions. Make Your Own Circular Slide Rule - Templates, directions, and some links to other slide rule sites. Eric's Introduction to the Slide Rule - Slide rule resources and links. How a Slide Rule Works - Short lesson. About Slide Rules - Explains how to use the different scales to multiply and divide.