December 1931 - Väisälä launches Finland's first radiosonde. He was a meteorological instrument inventor and a internationally recognised meteorologist. 1912-1948 - Väisälä works at the Finnish Central Meteorological Institute.
December 1931 - Väisälä launches Finland's first radiosonde. He was a meteorological instrument inventor and a internationally recognised meteorologist. 1912-1948 - Väisälä works at the Finnish Central Meteorological Institute.