Polygraph, United Kingdom, 1960-1970
Polygraphs are popularly known as ‘lie detectors’, but this was not their intended function. This polygraph recorded important information about a hospital patient which included blood pressure, temperature, heart rate and oxygen levels. It was made by Grass and Co. Machines like this can diagnose an illness, or monitor a patient’s condition during an operation. The polygraph records this information simultaneously. It saves medical professionals regularly checking the various life signs.
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a machine designed to detect and record changes in physiological characteristics, such as a person's pulse and breathing rates, used especially as a lie detector.