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There are three parts of a polygraph machine. They are:

  • the cardio-sphygmograph consisting of a blood pressure cuff placed on the arm that remains inflated during the test - measures blood pressure and heart rate
  • the pneumograph consisting of two tubes filled with air, one placed around the chest and the other placed around the abdomen - measures respiratory rate
  • the galvanograph which consists of electrical sensors attached to the fingertips - records the amount of perspiration produced
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