Instruction for Using a Slide Rule

The manual explains how to operate a slide rule, identifying its body, sliding cursor, hairline indicator, and scales labeled A, B, C, D, CI and K, then demonstrates practical techniques for multiplication, division, reciprocals, squares, cubes, and extraction of square and cube roots. It teaches setting and reading positions, handling decimal placement by scaling and mental estimation, and offers step-by-step examples that cover index selection and scale limitations. Practical tips address accuracy differences between scales and when to use inverse or half-length scales. The instructions are pitched to students, engineers, draftsmen, surveyors and others who need rapid approximate calculations.