Alexander Dahl

Dahl's alleged picture of the Earth's curvature probably mostly shows [[barrel distortion }}

Alexander Dahl (29 November 1892 – 15 December 1978) was a German industrialist, author and balloonist. He is known for his pioneering balloon flights, he made 107 different ascents throughout his life, especially his 1933 high altitude balloon attempt. Provided by Wikipedia
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