photoelectric cell

The light would reflect back to not one, but a bank of photoelectric cells.

It had the round structure of an eye, or a photoelectric cell.

The light pen itself had a small photoelectric cell in its tip.

That had depended upon the photoelectric cell, set in the top of the desk.

Probably a photoelectric cell, with a dark beam, invisible to the eye.

It was a photoelectric cell connected to a small tape recorder.

The best place for a photoelectric cell is a side of the building exposed to both the rising and the setting sun.

It is automatic and electric, its light controlled by photoelectric cells.

The photoelectric cells would be far more visible than the camouflaged ship.

Three photoelectric cells in the mirror detect light from the front, the rear and overhead.

At 2 o'clock or so, the photoelectric cell of the alarm system began clicking.

We used a photoelectric cell to govern the iris setting, but you can control that to some extent.

This discovery led to the invention of photoelectric cells, including those used in the earliest television systems.

The densitometer is basically a light source aimed at a photoelectric cell.

The early photoelectric cells were not very sensitive, so three or four would be used with the subject in a darkened booth.

The new ore-sorter has over 1000 photoelectric cells to scan rocks at a rate of 500 per second.

When that happened, lines of photoelectric cells in the ramp ceiling recorded the deviation.

It was the lens of a photoelectric cell.

Their lighting ruined the experiment, because it overloaded the photoelectric cells.

The flying spot developed as a remedy for the low sensitivity that photoelectric cells had at the time.

The television receiver would use the output of the photoelectric cell to drive a neon lamp.

And there's another wire running to... I'll bet those are photoelectric cells.

When mounting a transformer indoors, be sure to put the photoelectric cell, if any, outdoors.

When this had been accomplished, incident sunlight was now focused upon an expanse of photoelectric cells.

In the camera, the disk had a light-detecting device, usually a photoelectric cell, behind it.