File:Arago kilogram.jpg
Summary
The Arago Kilogram, one of the first <a href="https://en.wikipedia.org/wiki/Metric_system" class="extiw" title="en:Metric system">metric</a> 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 <a href="https://en.wikipedia.org/wiki/Francoise_Arago" class="extiw" title="en:Francoise Arago">Francoise Arago</a> 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 <a href="https://en.wikipedia.org/wiki/National_Institute_for_Standards_and_Technology" class="extiw" title="en:National Institute for Standards and Technology">National Institute for Standards and Technology</a>, Bethesda, Maryland.
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:13, 4 January 2017 | | 450 × 178 (47 KB) | 127.0.0.1 (talk) | The Arago Kilogram, one of the first <a href="https://en.wikipedia.org/wiki/Metric_system" class="extiw" title="en:Metric system">metric</a> 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 <a href="https://en.wikipedia.org/wiki/Francoise_Arago" class="extiw" title="en:Francoise Arago">Francoise Arago</a> 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 <a href="https://en.wikipedia.org/wiki/National_Institute_for_Standards_and_Technology" class="extiw" title="en:National Institute for Standards and Technology">National Institute for Standards and Technology</a>, Bethesda, Maryland. |
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