In the course of work at the Sandia Corporation, a definite need arose for the measurement of barometric pressures to an accuracy beyond that attainable with commercially available equipment. The standard instrument for measuring these pressures is the mercurial barometer. While a visual method of reading the instrument produced good results to within a 0.1 millimeter of mercury, it was dependent upon the operator using as a reference a target of sighting on the top of the meniscus formed in the barometer tube by the mercury.
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Electrical and Computer Engineering
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Eldridge, Arthur J.. "High Stability LC Oscillator for Use With a Capacitive Pressure Sensing Element." (1956). https://digitalrepository.unm.edu/ece_etds/311