Kilogram 18, UK copy of SI unit of mass C016 / 2043
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Kilogram 18, UK copy of SI unit of mass C016 / 2043
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) in a specially-designed glass and stainless steel enclosure. This is airtight and the temperature is maintained at 19 degrees Celsius. 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 alone, see image C016/2049. Photographed at the NPL, Teddington, UK
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Media ID 9216755
© NATIONAL PHYSICAL LABORATORY CROWN COPYRIGHT/SCIENCE PHOTO LIBRARY
1889 1900s Alloy Apparatus Container Cylinder Device Enclosure Engineering Iridium Mass Metal Metrology National Measurement Institute National Physical Laboratory Platinum Standard Weight Airtight Kilogram Laboratory
EDITORS COMMENTS
This print showcases Kilogram 18, the UK copy of the SI unit of mass. With a rich history dating back to its allocation in 1889, this standard kilogram is an essential part of scientific measurement. Housed at the National Physical Laboratory (NPL) in Teddington, England, it resides within a specially-designed glass and stainless steel enclosure. This airtight container ensures that the temperature remains constant at 19 degrees Celsius. The International Prototype Kilogram, made from a platinum-iridium alloy, is held at the Bureau International des Poids et Mesures (BIPM) in Sevres, France. However, for Kilogram 18 alone, one must refer to image C016/2049. Against a striking black background and bathed in studio lighting, this photograph captures both the historical significance and technological advancements embodied by this device. It serves as a testament to British engineering prowess during the late 19th century. With its intricate details and precise craftsmanship on display, this still life composition invites viewers into the world of metrology and physics research. As an integral part of national measurement institutes worldwide, such as NPL in Europe's United Kingdom region or BIPM globally recognized standards are upheld. Overall, this print beautifully encapsulates not only an important piece of scientific equipment but also highlights Britain's contribution to global standards in mass measurement throughout history.
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