File:Gaithersburg Observatory, 1940s.png

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Description

English: Earl Williams, an observer in the 1940s with the what was then called the U.S. Coast and Geodetic Survey — today's National Geodetic Survey — looks through the telescope in Gaithersburg, Md., that helped scientists study the Chandler wobble. Until it was shuttered in 1982, the observatory was one of five around the world that studied a wobble in the Earth’s axis. (U.S. Coast and Geodetic Archives)

Date

1940s

Source

https://archive.is/MQnpF#selection-945.0-945.400

Author

U.S. Coast and Geodetic Archives

Permission
(Reusing this file)

This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.

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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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