File:Platinum-Iridium meter bar.jpg
![File:Platinum-Iridium meter bar.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/Platinum-Iridium_meter_bar.jpg/800px-Platinum-Iridium_meter_bar.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:11, 14 October 2013 | ![]() | 4,232 × 2,781 (2.78 MB) | Xosema | Higher resolution. |
15:18, 1 May 2005 | ![]() | 270 × 175 (21 KB) | Svdmolen | International Prototype Metre standard bar made of platinum-irridium. This was the standard until 1960, when the new SI system used a krypton-spectrum measurement as the base. In 1983 the current metre was defined by a relationship to the speed of light i |
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