225 years ago today, the French National Assembly specified the platinum metre bar, presented on 22 June 1799 and deposited in the National Archives, as the final standard of the metre.

en.wikipedia.org

225 years ago today, the French National Assembly specified the platinum metre bar, presented on 22 June 1799 and deposited in the National Archives, as the final standard of the metre.

en.wikipedia.org

crimeschneck∈🇩🇪⊂🇪🇺@feddit.nlM to

Anniversaries: X years ago today@feddit.nlEnglish · 12 days ago

Metre - Wikipedia

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