Instruction for Using a Slide Rule

The manual says the slide rule is a device for easily and quickly multiplying, dividing and extracting square root and cube root. The manual states its purpose as explaining the operation in such a way that a person who has never before used a slide rule may teach himself to do so.

A section headed DESCRIPTION OF SLIDE RULE says the slide rule consists of three parts, with B the body of the rule carrying three scales marked A, D and K, and S the slider carrying three scales marked B, CI and C. A section headed CUBING AND CUBE ROOT says that to find the cube of any number on the slide rule, one sets the indicator over the number on the D scale and reads the answer on the K scale under the hair-line. In conclusion, the text says that those to whom the slide rule is a new method of doing their mathematical calculations will, if they form a habit of using it at work, study, or during recreations, be well rewarded in the saving of time and energy.