Part practical lie detector/polygraph/seismograph/chart recorder

This is a part-working chart recorder. Plenty of visual detail in the top control panel with a selection of knobs, switches & coloured lights. The paper feed is not fully 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 now no longer working & the pens are dried up & no longer available so produce no marks on the paper. You could pre-draw wiggly lines on the paper roll & wind it back in the machine.

Prop ID: 1971

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Age: 1980s

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