File:Arago kilogram.jpg

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Arago_kilogram.jpg (450 × 178 pixels, file size: 47 KB, MIME type: image/jpeg)

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English: The Arago Kilogram, one of the first metric standards used by the United States. It was procured by the US from France in 1821 to serve as primary standard for metric weights. It was made of platinum by the French firm Fortin and certified by French physicist François Arago to be within 1 mg of the "Kilogram of the Archives", the French prototype standard defining the kilogram. In 1866 the US Congress legalized, but did not require the use of metric measures in the United States. It served as the primary US standard for the kilogram until 1889, when the US received the current standards, K4 and K20, from the BIPM. The Arago Kilogram is now part of the NIST museum collection, US National Institute for Standards and Technology, Bethesda, Maryland.
Français : Kilogramme-étalon Arago, avec la pince spéciale pour le manipuler.
Le kilogramme Arago est l'un des premiers kilogrammes de référence du système métrique, système qui est adopté progressivement par les États-Unis d'Amérique. Il a été fourni par la France aux États-Unis en 1821 comme kilogramme-étalon dans les mesures de la masse avec cette unité. L'entreprise française Fortin l'a réalisé en platine. Il est certifié conforme avec une précision au milligramme près au kilogramme des Archives français par le physicien François Arago. En 1866, le Congrès des États-Unis légalise l'usage du système métrique mais sans le rendre obligatoire. Le kilogramme Arago sert de kilogramme-étalon américain jusqu'en 1889, quand les États-Unis réceptionnent le kilogramme K4 et le kilogramme K20 du Bureau international des poids et mesures (BIPM), encore en usage. Le kilogramme Arago fait désormais partie de la collection de l'institut national des normes et de la technologie (NIST), à Bethesda, dans le Maryland.
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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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