Practical lie detector/polygraph/seismograph/chart recorder

This is a mostly-working chart recorder that comes with a wired remote box with pressure sensitive pads that twitch the pens when pressed with your fingers. Plenty of visual detail in the top control panel with a selection of knobs, switches & coloured lights. The paper feed is not working as it should. It requires an out-of-shot hand to the left to apply slight tension to the leading edge of the paper so that the motorised rubber drive rollers grip it properly and regulate the paper speed as they should. This is easier to achieve than it sounds. The pen drawing system is fully working. There is an external wired box containing blue pressure sensitive pads which when pressed or tapped with your fingers, cause the respective pen to oscillate. It's easy to make three pens twitch & draw wiggly lines simultaneously.

Prop ID: 1971

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Age: 1980s

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