The first lie detector
This is a polygraph from the nineteenth century.
http://www.kenalder.com/liedetectors/media/6.LD.MareyPolygraph.jpg
http://www.kenalder.com/liedetectors/media/6.LD.MareyPolygraph.jpg
Analog Polygraph Machine
This polygraph from Canada was developed in 1974 and was used until 1994, when the Service updated all analog polygraphs with computerized polygraphs.
A Modern Polygraph
This is a modern British polygraph that is more accurate and gets test results faster than older models.
http://www.theabi.org.uk/press/p0307.htm
http://www.theabi.org.uk/press/p0307.htm