Metrigraph Model 80D Portable Polygraph, 1930's
The Metrigraph is a very early polygraph that gave end results with what it called a "“PSYCHOGALVANIC REFLEX" meter. This unit was a wales sample for a company called Federal Laboratories, a company that supplied law enforcement equipment. It ran on batteries which you can see from the first photograph required several and were very large. Amazingly, these are the batteries that came with the unit. It has a leather wrist band and two finger electrodes. The unit was made by Metrigraph Instrument Company of Burbank, Ca. Below is a close up photo of the product plate.

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