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151:. 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
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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.
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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
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at a military airport in 1943 during World War 2. The radiosonde consists of a battery-powered instrument package
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for US works (depending on the date of the author's death), such as Canada (70 years
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magazine, Ziff-Davis
Publishing Co., New York, Vol. 34, No. 6, June 1943, p. 97
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Note that it may still be copyrighted in jurisdictions that do not apply the
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Click on a date/time to view the file as it appeared at that time.
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Add a one-line explanation of what this file represents
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69:(1,228 × 1,703 pixels, file size: 447 KB, MIME type:
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Commons is a freely licensed media file repository.
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147:carried aloft with a helium-filled
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145:(white box)
127:Description
636:Radiosonde
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217:Radio News
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610:(447 KB)
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
