Tusi couple

Rarity: Common

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At a glance

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Notion

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Science and technology

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What Wikipedia says

The Tusi couple (also known as Tusi's mechanism) is a mathematical device in which a small circle rotates inside a larger circle twice the diameter of the smaller circle.

Excerpt from the Wikipedia article “Tusi couple”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nasir al-Din al-Tusi, Public domain, via Wikimedia Commons.