Bild:Platinum-Iridium meter bar.jpg

Us der alemannische Wikipedia, der freie Dialäkt-Enzyklopedy


Wikimedia Commons Logo Des Medium wird direkt vo Wikimedia Commons us ybunde.

Aagabe zur Quelle un d'Lizenz cha mer dört uf dr Bildbeschrybigssyte finde.

Es folgt der Inhalt der Datei-Beschreibungsseite.

International Prototype Metre standard bar made of platinum-iridium. This was the standard until 1960, when the new SI system used a krypton-spectrum measurement as the base. In 1983 the current metre was defined by a relationship to the speed of light in a vaccuum. (NIST)

http://www.mel.nist.gov/div821/webdocs-14/lsi_2.htm

Public domain This image is in the public domain because it contains materials that originally came from the National Institute of Standards and Technology.

Dateiversionen

Klicke auf einen Zeitpunkt, um diese Version zu laden.

Version vomBenutzerMaßeDateigrößeKommentar
aktuell16:18, 1. Mei 2005Svdmolen270×17521 KBInternational Prototype Metre standard bar made of platinum-irridium. This was the standard until 1960, when the new SI system used a krypton-spectrum measurement as the base. In 1983 the current metre was defined by a relationship to the speed of light i

Di folgende Sytene händ en Link zu dem Bildli: