File:NIST-Library-US-Prototype-meter-bar-colour HR 1.jpg
Size of this preview: 640 × 421 pixels.
 |
This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help. |
Summary
this was intended for use on en:Iridiumwhere a lower resolution of the same exact image already exists
| Description |
English: The original definition of a meter was adopted by CGPM (General Conference on Weights and Measures) in 1889 based on a platinum-iridium prototype bar. In 1889, there was one prototype meter, a bar made of a platinum iridium alloy with lines inscribed at each end; the distance between them defined the meter. The length standard was disseminated to the national laboratories through the use of artifact meters, which were accurate (but not identical) replicas of the prototype meter. Each artifact meter was calibrated against the prototype for use as a national standard. This standard remained in place until June 30 1959.
|
| Date | 27 February 2008 |
| Source | http://www.nist.gov/pml/wmd/metric/length.cfm |
| Author | The National Institute of Standards and Technology (NIST) |
Licensing
 |
This image is in the public domain because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
|
 |
File usage
The following pages on Schools Wikipedia link to this image (list may be incomplete):
Metadata
Find out about Schools Wikipedia
SOS Children's Villages aims to make Wikipedia suitable for young learners. SOS Children believes that a decent childhood is essential to a happy, healthy. Our community work brings families new opportunities through education, healthcare and all manner of support. Try to find out how you can help children in other countries on our web site.
