An Electrodata Model 53170 photo-diode reader used on the Datatron 205 electronic computer to read paper tape that has had programming holes suitable punched into it. The reading system consists of a bulb whose light in reflected by a mirror to then view the passing tape. Holes in the tape then are registered by photodiodes below the tape and are converted into computer code. The unit measures 41 cm wide by 23 cm high by 27 deep and was housed in the computer control console. (See Artifact 2018-215)
