Metre Convention
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The Metre Convention, also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations: Argentina, Austria-Hungary, Belgium, B
Woodcut dated 1800 illustrating the new decimal units which became the legal norm across all France on 4 November 1800
Triangulation near New York City, 1817
Ibáñez apparatus calibrated on the metric Spanish standard and used at Aarberg, in canton of Bern, Switzerland in 1880.
Preparing the first metre-alloy in May 1874, at the Conservatoire des Arts et Métiers, Paris
The International System of Units, internationally known by the abbreviation SI, is the modern form of the metric system and the world's most widely used system of measurement. It is the only system o
Metre Convention
…CGPM, convention was amended to its scope to other fields in physics. In 1960, at the eleventh meeting of the CGPM, its system of units was named the International System of Units (Système international d'unités, abbreviated SI). The Metre Convention provides that only nations can be members of the BIPM. In 1999, the CGPM created…
Silicon sphere for the Avogadro project used for measuring the Avogadro constant to a relative standard uncertainty of 2×10−8 or less, held by Achim Leistner
Stone marking the Austro-Hungarian/Italian border at Pontebba displaying myriametres, a unit of 10 km used in Central Europe in the 19th century (but since deprecated)
Closeup of the National Prototype Metre, serial number 27, allocated to the United States