Abstract
THE meaurement of an arc of the meridian between Dunkirk and the Spanish frontier, which has recently been completed with the highest precision by the French Government, shows that the measurement by Delambre and Méchain in determining the length of the metre was 146˙6 feet, or 1/2000th too short. The new measurement accords very closely indeed with the value as deduced from Clarke's ellipsoid.
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Geographical Notes. Nature 47, 115 (1892). https://doi.org/10.1038/047115a0
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DOI: https://doi.org/10.1038/047115a0