**Slide rule - Wikipedia**
https://en.wikipedia.org/wiki/Slide_rule

The slide rule is a mechanical analog computer. As a graphical analog calculator, the slide rule is closely related to a nomogram; the former is used for general calculations, the latter for application-specific computations. The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms, and trigonometry, and typically …

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