File:Cassegrain 85ft antenna Goldstone Deep Space Center.jpg
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Summary
| Description |
English: Feed horn and secondary reflector of 85 ft Cassegrain antenna at Goldstone Deep Space Communications Complex, California in 1963. This is a view from the bottom of the 85 ft diameter dish antenna, which is facing up, showing the feed. The radio waves from the spacecraft reflect off the dish to the small convex secondary reflector supported on the booms at top, then are reflected into the exponential feed horn inside the white pillar. where they are conducted through a waveguide to the receiver. |
| Date | |
| Source | Retrieved June 3, 2015 from James Joseph, "Ranger 6, Where Are You" in Popular Science" magazine, Popular Science Publishing Co., New York, Vol. 182, No. 6, June 1963, p. 67 on Google Books |
| Author | James Joseph |
| Permission (Reusing this file) |
This 1963 issue of Popular Science magazine would have the copyright renewed in 1991. 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 1978 and later show no renewal entries for Popular Science. Therefore the copyright was not renewed and it is in the public domain. |
Licensing
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:25, 14 June 2015 | | 320 × 887 (62 KB) | Chetvorno | User created page with UploadWizard |
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