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.
Photo Category: Instruments - Balloons
Photo Location: Missouri, St. Louis
Photo Date: 1905 Circa
| Added On | 19th October 2015 |
| Viewed | 17 viewed |