This balloon flight was performed as part of an extensive study of heavy primaries, particularly in the lower energy region by a collaboration between the cosmic ray group of the Institute for Nuclear Study, of Tokyo University and the University of Chicago. The effort was denominated "the Prince Albert Project" as the balloon flight was performed from that city of Canada.
At left can be seen a schematic view of the emulsion stack. It was composed by two hundred pellicles of Ilford G-5 nuclear emulsions of 4 inches by 6 inches, and 600 µ in thickness. These were stacked underneath a moving-plate mechanism consisting of two horizontal Lucite plates, 6 inches by 6 inches each, coated with 200 µ thick G-5 emulsion. A glass-backed G-5 emulsion and a pellicle, each 6 inches by 6 inches and 600 µ in thickness, were inserted between the stack and the moving-plate mechanism for the purpose of correlating the tracks passing through the whole system. An additional glass-backed G-5 emulsion also measuring 6 inches by 6 inches and 600 µ in thickness was placed horizontally on the very top of the assembly, its emulsion surface facing upward. The whole assembly was rigidly mounted into a pressurized aluminum sphere.
Balloon launched on: 9/11/1957 at ~ 4:10 cst
Launch site: Prince Albert Airport, Saskatchewan, Canada
Balloon launched by:
Balloon manufacturer/size/composition: Zero Pressure Balloon
End of flight (L for landing time, W for last contact, otherwise termination time): 9/11/1957 at ~ 16:10 cst
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): F 11 h
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