Léon Foucault
French physicist (1819–1868)
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Updated 2026-05-29
French physicist who made the speed of light measurable, spun up the gyroscope concept, and built a pendulum that basically proved Earth won't stop rotating. Also discovered eddy currents, because apparently one breakthrough per lifetime wasn't enough.
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Jean Bernard Léon Foucault was a French physicist who invented the Foucault pendulum, a device demonstrating the effect of Earth's rotation. He also made an early measurement of the speed of light, discovered eddy currents, and is credited with naming the gyroscope.
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Historical21.3
Source confidence60.0
Completeness70.0
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- WikidataHigh confidencewikidata · wikidata.org
- WikipediaHigh confidencewikipedia · en.wikipedia.org
- Pantheon 2.0High confidencedatabase · pantheon.world
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