The four major components that make up a polygraph machine are the pneumograph, galvanograph, cardiosphygmograph, and the kymograph. These components work together to be able to determine if a subject is deceitful of not.
Pneumograph - it records the changes in breathing of the subject Galvanograph - Records the skin resistance of the subject Cardiosphygmograph- Records the changes in blood pressure and pulse rate Kymograph - a motor that pulls or drive the chart paper under the recording pen
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