メートル原器
1. International Prototype MetreMetre bar, made of an alloy of platinum and iridium, that was the standard from 1889 to 1960. ]] The metre was originally defined as one ten-millionth of the distance between the North Pole and the equator at the longitude of Paris. Because of the difficulty of reproducing this measurement, a platinum bar nominally of that length was constructed in 1799 and housed in the Archives de la République in Paris.
Read “International Prototype Metre” on English Wikipedia
Read “メートル原器” on Japanese Wikipedia
Read “International Prototype Metre” on DBpedia
Read “International Prototype Metre” on English Wikipedia
Read “メートル原器” on Japanese Wikipedia
Read “International Prototype Metre” on DBpedia
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