On July 27, 1850, two French agronomists, Jacques Alexandre Bixio and Jean Augustin Barral, made an ascent by a hydrogen-filled balloon from the garden of the Paris Observatory. They had seven objectives which included measuring the effect of altitude on the decrease of temperature, the variation in solar radiation, hygrometry, chemical analysis of air, the polarization of light by clouds and other optical phenomena. They were equipped with 2 barometers, 3 thermometers, a Walferdin minimum thermometer, a hydrometer and an Arago polariscope. They reached a height of 7016 metres where the temperature had fallen to -39 degrees F.
July 24th, 2016
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