Filling the balloon of a ballon-sonde prior to launch. The French were thefirst to use small balloons filled with hydrogen to carry meteorologicalinstruments aloft.In: The Principles of Aerography by Alexander McAdie, 1917. Page 14.
10/23/2018 10:08:05 AM
Date: 1905 Circa
Location: Missouri, St. Louis
Subject: Instruments
Subject: Balloons