veragoth
he made the first suggestion to use galvanograph for detecting deception band on the works of several predecessors
John Augustus Larson
galvanize etching and engraving over aplate of metal
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
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 ratethe pneumograph consisting of two tubes filled with air, one placed around the chest and the other placed around the abdomen - measures respiratory ratethe galvanograph which consists of electrical sensors attached to the fingertips - records the amount of perspiration produced
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