Kilogram 18, UK copy of SI unit of mass C016 / 2049
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Kilogram 18, UK copy of SI unit of mass C016 / 2049
Kilogram 18, UK copy of SI unit of mass. The UKs National Standard Kilogram, copy number 18 of the International Prototype, was allocated in 1889 when the standard was established. It is kept at the National Physical Laboratory (NPL) as the national standard. Periodically, it is compared with the original and other copies. The International Prototype Kilogram, a cylinder of platinum-iridium alloy, is held at the Bureau International des Poids et Mesures (BIPM), at Sevres, France. For Kilogram 18 in its specially-designed glass and stainless steel enclosure, see image C016/2043. Photographed at the NPL, Teddington, UK
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Media ID 9217413
© NATIONAL PHYSICAL LABORATORY CROWN COPYRIGHT/SCIENCE PHOTO LIBRARY
1889 1900s Alloy Apparatus Cylinder Device Iridium Mass Metal Metrology National Measurement Institute National Physical Laboratory Platinum Scale Bar Standard Weight Kilogram Laboratory
EDITORS COMMENTS
This print showcases Kilogram 18, the UK's copy of the SI unit of mass. Dating back to 1889 when it was allocated as the national standard, this historical artifact holds immense significance in the field of metrology. Housed at the National Physical Laboratory (NPL) in Teddington, England, Kilogram 18 is periodically compared with both the original International Prototype and other copies. The International Prototype Kilogram itself is a platinum-iridium alloy cylinder held at the Bureau International des Poids et Mesures (BIPM) in Sevres, France. However, it is Kilogram 18 that serves as Britain's primary reference for mass measurements. Impeccably preserved within its specially-designed glass and stainless steel enclosure, this technological marvel stands as a testament to British ingenuity and scientific prowess. The monochrome studio shot captures every intricate detail of this single apparatus that has played an integral role in countless research endeavors over more than a century. With its rich history and undeniable importance within physics and measurement standards worldwide, Kilogram 18 symbolizes not only British excellence but also international collaboration in advancing our understanding of mass. This image serves as a reminder of how far we have come technologically since its creation while honoring its enduring legacy as an essential tool for accurate weight determination.
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