Launching a ballon-sonde, probably at St. Louis. The French were the first to use small balloons filled with hydrogen to carry meteorological instrumentsaloft.In: The Principles of Aerography by Alexander McAdie, 1917. Page 13.
10/23/2018 10:08:05 AM
Date: 1905 Circa
Location: Missouri, St. Louis
Subject: Instruments
Subject: Balloons