| Vaisala radiosondes
were extensively tested in various climates and environments. Pictured a
radiosonde launch in the sierras of Argentina in the '50s. |
| A Vaisala radiosonde
manufactured in 1955. |
| Performing upper air
observations in the late 1950's. |
| Vaisala participated
in the first international radiosonde comparison which was organized in
Payerne, Switzerland, in 1950. |
| The Vaisala
aerological station at Vaisala in the 1950's, where regular soundings have
been performed since 1958. |