This image shows early testing of hydrogen-filled balloons for radiosonde measurements. The theodolite in the image was used to track the balloon to the limit of visibility.
Revised
February 14, 2007
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/foundations/weather_obs/wea01106_650.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/foundations/weather_obs/wea01106_650.html