Attēls:Standard kilogram, 2.jpg

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Kopsavilkums

Apraksts
English: A national prototype kilogram standard mass, number K4, kept by the National Institute of Standards and Technology, USA, one of two which serve as the official standard for defining all units of weight and mass in the United States. It is a polished cylinder made of 90% platinum - 10% iridium alloy, 39 mm (1.5 inches) in diameter and 39 mm high. It is an exact copy of the international prototype kilogram kept at the International Bureau of Weights and Measures (Bureau International des Poids et Measures) in Sevres, France It was one of 40 copies which were presented by France in 1884 to different nations as national standards. This copy, K4, serves as a secondary comparison standard, while its twin, K20, serves as the primary standard. In 1884, it differed in mass from the prototype kilogram by about 75 micrograms. Alterations to image: Removed aliasing artifacts (stripes) due to scanning of halftone photo using GIMP FFT filter.
Datums
Avots National Geographic magazine, Vol. 27, No.1 (January 1915), p. 154, on Google Books. Photo credited to US National Bureau of Standards, now National Institute of Standards and Technology (NIST).
Autors NezināmsUnknown author
Atļauja:
(Šī faila izmantošana citur)		 Original work of the US federal government.

Licence

Public domain
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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Captions

Pievieno vienas rindiņas aprakstu, ko šis fails attēlo
this file represents the kilogram standard

Šajā failā attēlotais

attēlo

International Prototype of the Kilogram angļu

Faila hronoloģija

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tagadējais2013. gada 14. janvāris, plkst. 12.452013. gada 14. janvāris, plkst. 12.45 versijas sīktēls708 × 808 (119 KB)ChetvornoHigher resolution image
2011. gada 18. februāris, plkst. 01.452011. gada 18. februāris, plkst. 01.45 versijas sīktēls438 × 499 (52 KB)Quibik== {{int:filedesc}} == {{Information |Description={{en|A standard kilogram weight kept by the National Institute of Standards and Technology, USA, one of two which serve a

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