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| Keywords: A model of a 7-inch falling sphere NASA sond.png en These spheres originally developed by the University of Michigan were used to determine upper atmospheric density by measuring the drag on them as they fell after being released from a rocket at high altitude They contained an accelerometer in which the time-of-fall of a spherical bobbin was measured a telemetry system electronic control circuits and a battery power supply The flight sphere had the top and bottom enclosed by aluminum hemispheres EARLY YEARS OF AIR FORCE GEOPHYSICS RESEARCH CONTRIBUTING TO INTERNATIONALLY RECOGNIZED STANDARD AND REFERENCE ATMOSPHERES 24 Nov 1995 Kenneth S W Champion PD-USGov Uploaded with UploadWizard Earth's atmosphere Meteorological equipment Meteorological experiment | ||||
