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The "International Metre Convention" (in Switzerland Metervertrag), is an international treaty concluded on 20 May 1875, in which the 17 signatory states were "guided by the desire to secure international agreement and the perfection of the metric system". All internationally valid weights and measures today are based on the metric system. On 20 October 1983, the International Commission on Weights and Measures defined a metre as follows: The metre is the length of the distance travelled by light in a vacuum in the time interval of 1/299792458 of a second.

Maße - Elle und Urmeter

The picture on the left shows a cubit on the Old Town Hall in Braunschweig (Lower Saxony, Germany). The picture on the right shows the standard metre (Urmeter) made in 1797 and mounted on the façade of 36 rue de Vaugirard in Paris (France).

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Domäne Wachau (Wachau)

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