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https://www.noaa.gov/media/digital-library-photo/pl23wea01105jpgDescription
Army Air Force meteorologists prepare to launch hydrogen-filled balloonBalloon transported radiosonde that transmitted back to stationRadiosonde measured temperature, humidity, and pressureThis instrument was used up until just before the end of WWIIIceland post important for shipping and forecasting for European operations (Image credit: United States Army)