Apparatus for Cloud-Chamber Investigations with Free Balloons

Abstract
Apparatus for taking cloud‐chamber pictures in free balloon flights is described. The twelve‐inch cloud chamber is photographed once per minute by stereo cameras. The complete equipment for a six‐hour operation at 90,000 to 100,000 feet weighs 65 pounds and is housed in a 30‐inch diameter gondola equipped with temperature control.

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