Balance wheel

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, known as the balance spring or hairspring.

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

Image: Sandbachfizzy, CC BY-SA 4.0, via Wikimedia Commons.