File:Prototype mass drifts.jpg

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Prototype_mass_drifts.jpg ‎(790 × 500 pixels, file size: 202 KB, MIME type: image/jpeg)
Description
English: A graph of the relative change in mass of selected kilogram prototypes. From The Third Periodic Verification of National Prototypes of the Kilogram (1988—1992), G. Girard, Metrologia 31 (1994) 317—336. The International Prototype Kilogram (IPK) kept in Sevres, France, and the other national prototype kilogram standards have been found to vary in mass over the years. Since the IPK defines the kilogram, the only way to detect changes in mass is to compare the mass of the prototypes, which is done every 40 years. This graph shows the "mass drift" of the numbered prototypes compared to the IPK.
  • The IPK is represented by the stylized K in an old-English typeface.
  • No. 39, which lost 665 µg relative to the IPK, had originally been allocated to Japan in 1894. In 1958, following the Second World War, it was ceded to the Republic of Korea.
  • No. 23 was allocated to Finland in 1890.
  • No. 8(41) was accidentally stamped with the number 41, but its accessories carry the proper number 8: since there is no prototype marked 8, this prototype is referred to as 8(41).
Date (original upload date)
Source Transferred from en.wikipedia to Commons by Choihei using CommonsHelper.
Author Greg L at English Wikipedia


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Licensing[edit]

Greg L at the English language Wikipedia, the copyright holder of this work, hereby publishes it under the following license:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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Attribution: Greg L at the English language Wikipedia
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Original upload log[edit]

The original description page was here. All following user names refer to en.wikipedia.

  • 2007-12-11 17:12 Greg L 790×500× (206527 bytes)
  • 2007-12-11 17:03 Greg L 790×500× (206652 bytes)
  • 2007-12-11 04:41 Greg L 790×500× (206652 bytes)
  • 2007-12-10 07:27 Greg L 790×500× (193555 bytes)
  • 2007-12-10 07:16 Greg L 790×500× (183198 bytes)
  • 2007-12-10 04:22 Greg L 790×500× (194748 bytes) A graph of the relative change in mass of selected kilogram prototypes. From ''The Third Periodic Verification of National Prototypes of the Kilogram (1988–1992)'', G. Girard, Metrologia '''31''' (1994) 317–336

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Date/TimeThumbnailDimensionsUserComment
current21:53, 17 December 2008Thumbnail for version as of 21:53, 17 December 2008790 × 500 (202 KB)File Upload Bot (Magnus Manske) (talk | contribs) {{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|A graph of the relative change in mass of selected kilogram prototypes. From ''The Third Periodic Verification of National Prototypes of the Kilogram (1988–1992)'', G. Girard,
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Orientation Normal
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
Software used Adobe Photoshop CS2 Macintosh
File change date and time 09:09, 11 December 2007
Color space Uncalibrated
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