Kater's pendulum

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Notion

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Science and technology

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What Wikipedia says

A Kater's pendulum is a reversible free swinging pendulum invented by British physicist and army captain Henry Kater in 1817 (made public on 29 January 1818), for use as a gravimeter instrument to measure the local acceleration of gravity.

Excerpt from the Wikipedia article “Kater's pendulum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Henry Kater, Public domain, via Wikimedia Commons.