Old skool Canadian ‘fruit machine’
The fruit machine is a jocular term for a device developed in Canada that was supposed to be able to identify homosexuals. The subjects were made to view pornography, and the device measured the pupils of the eyes, perspiration, and pulse for a supposed erotic response.
The chair was like that in a dentist office. It had a pulley with a camera going towards the pupils. There was a black box in front of it that showed pictures. The pictures ranged from the mundane to sexually explicit photos of men and women. People were told the machine was to rate stress. After knowledge of its real purpose became widespread, few people volunteered for it.
Ah the crazy 50′s and 60′. Obviously this machine had major flaws.

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