Many inexplicable accidents have been attributed to the lack of physical adaptability of pilots in the rarefied air and intense cold of great heights. To investigate this important problem, the French Air Ministry has constructed a pneumatic caisson from which air can be withdrawn at will and which can be cooled by means of a refrigerating machine, so that the occupants of the chamber may be made to experience these effects. Into this chamber three well known French military aviators, armed with oxygen tanks and clothed in fur costumes, were recently introduced...
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