Slide Rule

A slide rule is a hand-operated mechanical calculator consisting of slidable rulers for conducting mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry. It is one of the simplest analog computers.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.5

GOLDENSPIRAL

The mathematics of beauty — Fibonacci, the golden ratio, and the patterns that shape nature, art, and design.

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