[{WikipediaArticle oldid='223697825'}]



[{VerifyArticle user='eertl' template='Standard' date='04. Juni 2014' page-date='2014' comment='Überprüft, nach Physik für Ingenieure; Physik 1, Zusammenhänge zu anderen gebräuchlichen Einheiten wurden überprüft mit www.mathe-lexikon.at' funder='21' }]
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!!!License Information of Images on page
||Image Description||Credit||Artist||License Name||File
| The Wikimedia Commons logo, SVG version.| Original created by Reidab ( PNG version ) SVG version was created by Grunt and cleaned up by 3247 . Re-creation with SVG geometry features by Pumbaa , using a proper partial circle and SVG geometry features. (Former versions used to be slightly warped.)| Reidab , Grunt , 3247 , Pumbaa| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Commons-logo.svg
| Begriffsklärungs-Icon (Autor: Stephan Baum)| Eigenes Werk ( Originaltext: Own drawing by Stephan Baum ) Original Commons upload as File:Logo Begriffsklärung.png by Baumst on 2005-02-15| Stephan Baum| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Disambig-dark.svg
| The metre was originally defined in 1791 as being 1/10,000,000 of the distance from the North Pole to the Equator through Paris, making the kilometer 1/10,000 of this distance. 1| File:Globe Atlantic.svg| US Government; adapted by User:Martinvl| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Kilometre definition.svg
| Krypton-86-Lampe für die Meter-Definition zwischen 1960 und 1983. Lt. Quelle ausgestellt in Raum 6 des NIST-Museums.| http://museum.nist.gov/object.asp?ObjID=49| NIST Museum| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Krypton-86-lamp NIST 49.jpg
| One of the historical (18th century), standard-meter (mètre-étalon) by Chalgrin located at 36, rue de Vaugirard in Paris| Eigenes Werk| LPLT| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Mètre-étalon Paris.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 krypton 86.  This bar is now in the collection of the NIST Museum, Gaithersburg, Maryland, USA. After the Treaty of the Meter had been signed in 1875, the BIPM in Sevres, France made 30 prototype standard bars of 90% platinum–10% iridium alloy.  One of the bars was selected as the International Meter.  Small elliptical areas on the upper surface of the central rib at each end of the bars were highly polished, and three lines, nominally 0.5 mm apart, were ruled on these surfaces, the distance between the middle lines of each group at the temperature of freezing water defining the meter.  The bars had a modified X cross section named for the French scientist, Henri Tresca , who proposed it. The Tresca section was designed to provide maximum stiffness-to-weight ratio, reduce thermal accommodation time, and to enable the graduation lines to be located on the "neutral" axis of the bar, where change in length with flexure is minimum.  After selecting the bar to be used as the International Prototype Meter, the other bars were calibrated relative to it and given to nations to serve as their national standards.  The United States received National Prototype Meters No. 27 and No. 21 in 1890.  The US adoption of the metric system in 1893 made the meter the fundamental length standard of the US, and No. 27 became the primary national standard for all length measurements. The relationship between No. 27 and the International Prototype Meter was certified to be 1 m − 1.6 µm + 8.657 µm·T + 0.001 µm·T 2 ± 0.2 µm with T in degrees centigrade. Intercomparison between the International Meter and No. 27 yielded a probable error of ±0.04 µm. The probable uncertainty of the length of No. 27 at temperatures between 20°C and 25°C was estimated by BIPM to lie between ±0.1 µm and ±0.2 µm.| This image was copied from wikipedia:en.  Transwiki approved by: w:en:User:Dmcdevit .  The original description was: National meter #27. From w:en:NIST museum. Original from National Prototype Meter No. 27, Room 4, Weights and Measures, NIST Virtual Museum , US National Institute of Standards and Technology (NIST) website.  No copyright information accompanied this image.| Autor/-in unbekannt Unknown author| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:US National Length Meter.JPG
| Wikisource logo, no text variant| By Rei-artur pt en Rei-artur blog| Nicholas Moreau| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Wikisource-logo.svg
| | | | [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Wiktfavicon en.svg
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