This is a paper & ink chart recorder which has been modified by Electroprops to simulate a polygraph (or seismograph). In use, the roll-fed paper feeds forwards at a uniform speed & the pen can be made to twitch by tapping on the pressure sensitive pad on the wired controller box visible in the picture. It's actually very easy to use as increasing pressure produces longer sweeps of the pen. We supply wires & pads for taping to the subject that in real life would be detecting the varying galvanic skin resistance. It's sufficiently easy to set up & use that it's a completely user operated & also highly visual prop. We can also rig this to display other changing voltages such as those produced by muscle signals or various electronic sources.
Prop ID: 1646