This edition revises the original pamphlet to give non‑mathematical readers a straightforward path to using the 25 cm slide-rule, including basic setup, direct proportion, squares and roots, cubes, trigonometry, log-log scales, and plotting curves from equations. It emphasizes hands-on techniques and practical examples, while also explaining the role of logarithms in making calculations easier.

Step-by-step explanations of how slide-rules perform multiplication, division, and proportion.
Guidance on solving triangles, trigonometry, and even spherical triangle problems using the slide-rule.
Tips for plotting curves and understanding the central scales and log-log scales for better accuracy.
Illustrative examples and exercises that build confidence without heavy theory.

Ideal for students, engineers, surveyors, and anyone curious about the practical use of slide-rules and logarithms to make quick, reliable calculations.

"About this title" may belong to another edition of this title.

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