It couldn't be a hookup with a photoelectric eye.

It did this after first weighing each petri dish, and examining any growth with its photoelectric eye.

He was being held by an incredible metal giant whose shining photoelectric eyes looked down at him from a seven-foot height.

A photoelectric eye searched you automatically as you passed through its invisible beam in the hallway outside.

The three robots parted to make room for him and kept their photoelectric eyes fixed firmly on Daneel.

Most of these lights are equipped with a photoelectric eye, which turns the light on at dusk.

The great body had already been scanned by photoelectric eyes and its dimensions fed into the computer controlling the operations.

It flashed directly into the sensitive mechanism of the tiny photoelectric eye.

It was he who moved the light to the photoelectric eye in the door of the powder mill.

His photoelectric "eyes" could distinguish red and green light.