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The '''Schiehallion experiment''' was an 18th-century [[experiment]] to determine the [[Arithmetic mean|mean]] [[density of the E ...barren.|[[Chimborazo]] in the [[Andes]] in [[Ecuador]], the subject of the French 1738 experiment]] ...

...actions. The system became the standard of France and Europe within half a century. Other measures with unity ratios<ref group="Note">ratios of 1 between mag ...irst practical realisation of the metric system came in 1799, during the [[French Revolution]], after the existing system of measures had become impractical ...

...the [[seconds pendulum]] (a pendulum with a half-period of one second) one century earlier, but this was rejected as it had been discovered that this length v ...des Archives]]}}, a platinum bar held in Paris. During the mid nineteenth century, following the [[American Revolution]] and [[Decolonization of the Americas ...

...or [[panemone windmill]] first appeared in [[Greater Iran]] during the 9th century.<ref>Glick, Thomas F., Steven Livesey, and Faith Wallis. Medieval science, The 9th century mathematician [[Muhammad ibn Musa al-Khwarizmi]] founded algebra and expand ...