File:Hale telescope mirror during grinding 1945.jpg
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Summary
[edit]DescriptionHale telescope mirror during grinding 1945.jpg |
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 |
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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
[edit]Public domainPublic domainfalsefalse |
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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:30, 28 March 2022 | 757 × 615 (165 KB) | Holly Cheng (talk | contribs) | Cropped 22 % horizontally using CropTool with precise mode. | |
22:43, 4 November 2015 | 970 × 615 (121 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Image title |
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Credit/Provider | Paul Calvert |
Source | Los Angeles Times |
Width | 2,850 px |
Height | 3,434 px |
Pixel composition | Black and white (Black is 0) |
Orientation | Normal |
Number of components | 4 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS5.1 Macintosh |
File change date and time | 15:55, 14 March 2012 |
Exif version | 2.21 |
Color space | Uncalibrated |
Unique ID of original document | 11A2547164730ACDBCA8281E0CA5A092 |
Date and time of digitizing | 13:49, 13 March 2012 |
Date metadata was last modified | 08:55, 14 March 2012 |