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Waarnemingen in de dampkring. Kolonel Herrera bezig met de voorbereidingen om in een open gondel met een stratosfeerballon op te stijgen tot een hoogte van 25.000 meter, Spanje 1935. Foto: Het stratosfeerpak wordt opgepompt tot er een druk van 1, driekwart atmosfeer, wat nodig is om de geringe luchtdruk op grote hoogte te compenseren ten behoeve van de bloedsomloop.