File:Launching radiosonde 1943.jpg

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Summary

DescriptionLaunching radiosonde 1943.jpg	English: US sailors launching a radiosonde at a military airport in 1943 during World War 2. The radiosonde consists of a battery-powered instrument package (white box) carried aloft with a helium-filled weather balloon. As it ascends it measures temperature, humidity, and air pressure and radios the information to a ground receiver. At an altitude of around 70,000 ft (23 km) the balloon pops, and the radiosonde floats back to earth suspended by the the red parachute visible on the support line. By WW2 the US Weather Bureau launched weather balloons daily from 80 sites around the US
Date	1943
Source	Retrieved June 12, 2014 from Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 34, No. 6, June 1943, p. 97 on American Radio History site
Author	Unknown authorUnknown author
Permission (Reusing this file)	This 1943 issue of Radio News magazine would have the copyright renewed in 1970. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1970 show no renewal entries for Radio News. Therefore the magazine's 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.

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