National meter #27. From <a href="http://en.wikipedia.org/key/NIST" class="extiw" title="w:NIST">w:NIST</a> museum After the Treaty of the Meter had been signed in 1875, the International Bureau of Weights and Measures (BIPM) in Sevres, France made 30 prototype line standards of platinum-iridium. The bars had a modified X cr
(National meter #27. From <a href="http://en.wikipedia.org/key/NIST" class="extiw" title="w:NIST">w:NIST</a> museum After the Treaty of the Meter had been signed in 1875, the International Bureau of Weights and Measures (BIPM) in Sevres, France made 30 prototype line standards of platinum-iridium. The bars had a modified X cr)
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Transwiki approved by: w:en:User:Dmcdevit This image was copied from wikipedia:en. The original description was: National meter #27. From w:en:w:NIST museum After the Treaty of the Meter had been signed in 1875, the International Bureau of Weig