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Thermasonde
Thermasonde
Thermasonde

A US Weather Service Technician Releasing A Thermasonde (weather balloon) Los Angeles, California - September, 1973.

There were other types of "sondes" as well, some called radiosondes, depending upon what was being studied. There are also various other sizes and shapes.
Photo: Gene Daniels, US Environmental Protection Agency
National Archives and Records Administration
Still Picture Branch - College Park, Maryland
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