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File:Hale telescope mirror during grinding 1945.jpg

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Summary

Description
English: The mirror of the 200-inch Hale telescope at Mt. Palomar Observatory, California in the Caltech Optical Shop in Pasadena when grinding work was resumed following the end of World War 2. It is the largest single piece telescope mirror in the world. The mirror was cast of pyrex glass in 1923 at Corning Glass Works, New York. Grinding work was halted in 1942 due to pressing war work. The mirror was transported to Palomar Observatory in 1947 and the telescope was completed and saw first light in 1949. The honeycomb support structure on the back of the mirror can be seen through the surface.
Date
Source
Author Paul Calvert, Los Angeles Times
Permission
(Reusing this file)		 This 1945 issue of The Los Angeles Times newspaper would have the copyright renewed in 1973. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1973 show no renewal entries for The Los Angeles Times. Therefore the copyright was not renewed and it is in the public domain.

Licensing

Public domain
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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Captions

The primary mirror of the Hale telescope during grinding

Items portrayed in this file

depicts

inception

4 December 1945

File history

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Date/TimeDimensionsUserComment
current12:30, 28 March 2022757 × 615 (165 KB)Holly ChengCropped 22 % horizontally using CropTool with precise mode.

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