Fraunhofer_spectroscope.JPG
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Summary
Description Fraunhofer spectroscope.JPG | Joseph von Fraunhofer demonstrating the spectroscope. On left Joseph von Utzschneider, on right Georg Friedrich von Reichenbach. Photogravure from a painting by Richard Wimmer. |
Date | |
Source | "Essays in astronomy" - D. Appleton & company, 1900 ( LCCN 00004435) |
Author | Richard Wimmer |
Licensing
Public domain Public domain false false |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer . This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office ) before January 1, 1929. |
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/ PDM Creative Commons Public Domain Mark 1.0 false false