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== Metre Media ==
== Metre Media ==
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File:Obs-Paris-meridienne.jpg|The Meridian room of the [[Paris Observatory]] (or Cassini room): the [[Paris meridian]] is drawn on the ground.
File:Obs-Paris-meridienne.jpg|Salle Méridienne (dite salle Cassini), Observatoire de Paris, XIVe arrondissement
File:Panthéon de Paris, 16 January 2016.jpg|Panthéon de Paris, 16 January 2016
File:Repsold.jpg|[[Gravimeter]] with variant of [[Repsold-Bessel pendulum]].
File:HasslerCollection 001.jpg|Triangulation near [[New York City]], 1817
File:HasslerCollection 001.jpg|Triangulation near [[New York City]], 1817
File:Appareil Ibáñez.jpg|Mesure d'un base géodésique dans le Grand-Marais en Suisse avec l'appareil conçu par Carlos Ibáñez e Ibáñez de Ibero et réalisé à Paris par les frères Léon et Émile Brunner. Cette règle géodésique est calibrée sur le mètre.
File:Appareil Ibáñez.jpg|Ibáñez apparatus calibrated on the metric Spanish Standard and used at [[Aarberg]] in [[canton of Bern]], [[Switzerland]].
File:Repsold.jpg|Péndulo de Barraquer.
File:Britannica_Figure_of_the_Earth.jpg|Britannica_Figure_of_the_Earth
File:Struve Geodetic Arc-zoom-en.svg|Zoom version of the map of the Struve Geodetic Arc. The 34 red points are the places registered in the UNESCO World Heritage Site.
File:US National Length Meter.JPG|Closeup of National Prototype Meter Bar No. 27, made in 1889 by the International Bureau of Weights and Measures (BIPM) and given to the United States, which served as the standard for defining all units of length in the US from 1893 to 1960. In 1960 the SI changed the standard of length to define the meter by the wavelength of light of a spectral line of
File:Metric standards Rijksmuseum.jpg|Historic Dutch replicas of metric standards in the collection of Rijksmuseum, Amsterdam: iron metre with case constructed by Étienne Lenoir in 1799, copper grave kilogram with case (1798), copper volume measures (1829).
File:Metre alloy.jpg|Preparing the first metre-alloy in May 1874, at the Conservatoire des Arts et Métiers, Paris
File:Metre alloy.jpg|Preparing the first metre-alloy in May 1874, at the Conservatoire des Arts et Métiers, Paris
File:US National Length Meter.JPG|Closeup of National Prototype Metre Bar No. 27, made in 1889 by the International Bureau of Weights and Measures (BIPM) and given to the United States, which served as the standard for defining all units of length in the US from 1893 to 1960
File:Komplet invarskih žica.png|Invar wire baseline apparatus.
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</gallery>
== Related pages ==
== Related pages ==
[[Category:SI units]]
[[Category:SI units]]
[[Category:Units of length]]
[[Category:Units of length]]