Best known mechanical device to detect lying is the polygraph, perfected by Professor Leonarde Keeler of Northwestern University. A subject attached to the polygraph who tells an untruth supposedly registers changes in blood pressure, pulse and respiration which are indicated by a needle jiggling on a graph. Tested last week in Manhattan was another such instrument—the psychogalvanometer. The invention of tall, burly Father Walter G. Summers, S.J., Ph.D., head of Fordham University's department of psychology, the psychogalvanometer works not on the heart and lungs but on the minute electrical currents coursing through...
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