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How Did The Meter Get Its Length?

One of 30 copies of the first protoype meter made  by the International Bureau of Weights and Measures (BIPM) in Sevres, France. 1875-1889 <em> </em>
One of 30 copies of the first protoype meter made by the International Bureau of Weights and Measures (BIPM) in Sevres, France. 1875-1889 <em> </em>

Copyright 2014 NPR

Corrected: June 22, 2014 at 10:00 PM MDT
Previous versions of this story said a platinum bar cast in the 19th century was what the world used as the official length of a meter. It was the first official standard for the length of the meter. There's another in effect today.
Corrected: June 22, 2014 at 10:00 PM MDT
Previous versions of this story said a platinum bar cast in the 19th century was what the world used as the official length of a meter. It was the first official standard for the length of the meter. There's another in effect today.
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