Filling the balloon of a "ballon-sonde" prior to launch. The French were the
first to use small balloons filled with hydrogen to carry meteorological
instruments aloft.
In: "The Principles of Aerography" by Alexander McAdie, 1917. Page 14.
Image ID: wea01138, NOAA's National Weather Service (NWS) Collection Location: St. Louis, Missouri Photo Date: 1905 Circa
