File:S band angel 1959.png
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Size of this preview: 611 × 599 pixels. Other resolutions: 245 × 240 pixels | 489 × 480 pixels | 783 × 768 pixels | 1,044 × 1,024 pixels | 1,647 × 1,616 pixels.
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Summary
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| Description |
English: S-band "radar angel" seen in a 1959 Air Force report. |
| Date | |
| Source | DTIC file, "Spurious Echos on Radar, A Survey", Vernon G. Plank, May 1959, US Air Force, found here: https://apps.dtic.mil/sti/tr/pdf/AD0215470.pdf |
| Author | Vernon Plank |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:11, 9 April 2024 | | 1,647 × 1,616 (663 KB) | Obscure2020 (talk | contribs) | Extracted bitmap from source PDF using pdfimages on the command line. Cropped and converted to PNG using GIMP. Optimized with OxiPNG and ZopfliPNG for good measure. |
| 19:44, 8 May 2020 |  | 1,014 × 880 (449 KB) | Oaktree b (talk | contribs) | Uploaded a work by Vernon Plank from DTIC file, "Spurious Echos on Radar, A Survey", Vernon G. Plank, May 1959, US Air Force, found via Google with UploadWizard |
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