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POLYGRAPH INSTRUMENT HISTORY

Please "Click" on a link to see a photo and read a brief history on the instrument.

B & W LIE DETECTOR
Model 8AC


KEELER POLYGRAPH
PACESETTER SERIES MODEL 6308
 

KEELER POLYGRAPH
MODEL 6317


KEELER POLYGRAPH
MODEL 6338


KEELER POLYGRAPH
MODEL 302


LAFAYETTE ELECTRO-CARDIO POLYGRAPH
MODEL 76056


LEE AND SONS
BERKELEY PSYCHOGRAPH


STOELTING DECEPTOGRAPH
MODEL 22500 



STOELTING MODEL 22600
EMOTIONAL STRESS MONITOR


STOELTING CARDIO-PNEUMO POLYGRAPH 

"MORE TO COME"

Acknowledgments

Special thanks to the Texas Department of Public Safety Polygraph Examiners Class of 1999 for the research, organization and presentation of the information contained on this page and it's links. The historic background information was obtained from numerous journals including manuals from Stoelting, Lafayette and Keeler Instrument Company. Additional information was obtained from several other investigators and a telephone interview with Cleve Baxter.

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