![Dr. Jean Piccard, stratosphere balloonist demonstrated automatic ballast release. June 7, 1945. The University of Minnesota professor of aeronautical engineering said this type of device was used on Japanese balloon bombs set Dr. Jean Piccard, stratosphere balloonist demonstrated automatic ballast release. June 7, 1945. The University of Minnesota professor of aeronautical engineering said this type of device was used on Japanese balloon bombs set](https://c8.alamy.com/comp/F2B0J4/dr-jean-piccard-stratosphere-balloonist-demonstrated-automatic-ballast-F2B0J4.jpg)
Dr. Jean Piccard, stratosphere balloonist demonstrated automatic ballast release. June 7, 1945. The University of Minnesota professor of aeronautical engineering said this type of device was used on Japanese balloon bombs set
![Dr. Jean Piccard was engineer, professor and high-altitude balloonist. October 25, 1934. His inventions were used in balloon flight, aircraft, and spacecraft. By L. Oeyen, Cleveland press photographer. (CSU 2015 9 1091 Stock Photo - Alamy Dr. Jean Piccard was engineer, professor and high-altitude balloonist. October 25, 1934. His inventions were used in balloon flight, aircraft, and spacecraft. By L. Oeyen, Cleveland press photographer. (CSU 2015 9 1091 Stock Photo - Alamy](https://c8.alamy.com/comp/F2B0J3/dr-jean-piccard-was-engineer-professor-and-high-altitude-balloonist-F2B0J3.jpg)
Dr. Jean Piccard was engineer, professor and high-altitude balloonist. October 25, 1934. His inventions were used in balloon flight, aircraft, and spacecraft. By L. Oeyen, Cleveland press photographer. (CSU 2015 9 1091 Stock Photo - Alamy
![Discuss new stratosphere flight. Prof Jean Piccard (right), discussing with his twin brother, Prof A Discuss new stratosphere flight. Prof Jean Piccard (right), discussing with his twin brother, Prof A](https://cdn.imago-images.com/bild/st/0081309706/m.jpg)
Discuss new stratosphere flight. Prof Jean Piccard (right), discussing with his twin brother, Prof A
William Swann, Jeannette Ridlon-Piccard, and Jean Piccard at Picard stratosphere flight | Niels Bohr Library & Archives
![Jean Piccard, Swiss-American chemist and balloonist - Stock Image - C052/5415 - Science Photo Library Jean Piccard, Swiss-American chemist and balloonist - Stock Image - C052/5415 - Science Photo Library](https://media.sciencephoto.com/c0/52/54/15/c0525415-800px-wm.jpg)