File:Waveguide dummy load.jpg

No higher resolution available.

Waveguide_dummy_load.jpg ‎(310 × 196 pixels, file size: 39 KB, MIME type: image/jpeg)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

DescriptionWaveguide dummy load.jpg	English: A high power microwave dummy load used for testing waveguide systems. A dummy load is a waveguide termination that absorbs all the microwave power applied to it without reflecting any, converting the microwaves to heat. It has heatsink fins to dissipate the heat. The flange visible on the righthand side is attached to a waveguide.
Date	November 1952
Source	Retrieved March 30, 2015 from Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 11, No. 11, November 1952, p. 78 on American Radio History website
Author	Unknown authorUnknown author
Permission (Reusing this file)	This 1952 issue of Tele-Tech magazine would have the copyright renewed in 1980. 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 1979, 1980, and 1981 show no renewal entries for Tele-Tech. Therefore the copyright was not renewed and it is in the public domain.

Licensing

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.

العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−