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FULL-RANGE RADIOSONDE HYPSOMETER.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
Evidence gathered by laboratory experimentation indicates the full-range hypsometers to be inherently accurate to 100 feet of altitude, providing proper boiling of the liquid is maintained. Proper boiling was difficult to maintain in some of the earlier-type hypsometers tested because of the refluxing of cool liquid down the detecting thermistor leads in the hypsometers. Proper boiling was not difficult to maintain in the later hypsometer models except in those units tested where it was obvious that the detecting thermistors used in the transistorized heater circuit were poorly positioned in the assembled hypsometer. In general, it is obvious from the tests that further investigation and design are necessary on the hypsometer to improve the operation of the heater circuit before an optimum design leading to reliable units in production quantities is obtained. The results of these tests conclusively prove the feasibility and great inherent accuracy of the full-range hypsometer, but added research and redesign are required before these hypsometers can become reliable field units. Author